The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Hongwei Liu - One of the best experts on this subject based on the ideXlab platform.
-
stucturally diverse sesquiterpenes produced by a chinese tibet fungus Stereum hirsutum and their cytotoxic and immunosuppressant activities
Organic Letters, 2015Co-Authors: Jinwei Ren, Li Bao, Yi-jian Yao, Liwei Sun, Wei Yue, Qinmiao Sun, Wenbing Yin, Hongwei LiuAbstract:Two new heterodimeric sesquiterpenes, sterhirsutins C (1) and D (2), along with eight new sesquiterpenoid derivatives, sterhirsutins E–-L (3–10), were isolated from the culture of Stereum hirsutum. The absolute configuration of 1 was assigned by a single-crystal X-ray diffraction experiment. Compounds 1 and 2 possessed an unprecedented chemical skeleton with a 5/5/5/6/9/4 fused ring system. Compound 10 is the first sesquiterpene coupled with a xanthine moiety. Compounds 1–10 showed cytotoxicity against K562 and HCT116 cell lines. Compound 9 induced autophagy in HeLa cells. Compound 5 inhibited the activation of IFNβ promoter in Sendai virus infected cells.
-
Sterhirsutins A and B, Two New Heterodimeric Sesquiterpenes with a New Skeleton from the Culture of Stereum hirsutum Collected in Tibet Plateau.
ChemInform, 2015Co-Authors: Li Bao, Jinwei Ren, Jun-jie Han, Zong-yao Zhang, Yi-jian Yao, Rui Cao, Hongwei LiuAbstract:The two new sterhirsutins A (I) and B (II), as well as the new hirsutic acids D (III) and E (IV) are isolated from Stereum hirsutum.
-
Stucturally Diverse Sesquiterpenes Produced by a Chinese Tibet Fungus Stereum hirsutum and Their Cytotoxic and Immunosuppressant Activities
2015Co-Authors: Jinwei Ren, Li Bao, Yi-jian Yao, Liwei Sun, Wei Yue, Qinmiao Sun, Wenbing Yin, Hongwei LiuAbstract:Two new heterodimeric sesquiterpenes, sterhirsutins C (1) and D (2), along with eight new sesquiterpenoid derivatives, sterhirsutins E–-L (3–10), were isolated from the culture of Stereum hirsutum. The absolute configuration of 1 was assigned by a single-crystal X-ray diffraction experiment. Compounds 1 and 2 possessed an unprecedented chemical skeleton with a 5/5/5/6/9/4 fused ring system. Compound 10 is the first sesquiterpene coupled with a xanthine moiety. Compounds 1–10 showed cytotoxicity against K562 and HCT116 cell lines. Compound 9 induced autophagy in HeLa cells. Compound 5 inhibited the activation of IFNβ promoter in Sendai virus infected cells
-
Sterhirsutins A and B, two new heterodimeric sesquiterpenes with a new skeleton from the culture of Stereum hirsutum collected in Tibet Plateau.
Organic letters, 2014Co-Authors: Li Bao, Jinwei Ren, Jun-jie Han, Zong-yao Zhang, Yi-jian Yao, Rui Cao, Hongwei LiuAbstract:Two new heterodimeric sesquiterpenes, sterhirsutins A (1) and B (2), and two new sesquiterpenes, hirsutic acids D–E (3 and 4), were identified from the culture of Stereum hirsutum. The absolute configurations in 1 and 2 were confirmed by single-crystal X-ray diffraction experiments and electronic circular dichroism (ECD) calculations. Compounds 1 and 2 are likely biosynthesized from a hirsutane-type sesquiterpene and α-humulene by a hetero-Diels–Alder cycloaddition. Compounds 1–4 showed cytotoxicity against K562 and HCT116 cell lines.
-
Depside α-glucosidase inhibitors from a culture of the mushroom Stereum hirsutum.
Planta medica, 2014Co-Authors: Bo Tao Wang, Jun-jie Han, Yunfei Pei, Hongwei LiuAbstract:Nine new isoprenylated depsides, sterenins E–M ( 1 – 9 ), as well as five known compounds ( 10 – 14 ), were isolated from the solid culture of Stereum hirsutum . The structures of the new compounds were elucidated by spectroscopic methods. Their inhibitory activities against yeast α -glucosidase were evaluated in vitro . Compounds 1 – 4 and 7 – 14 showed inhibitory activities with IC 50 values of 7.62, 3.06, 6.03, 22.70, 36.64, 13.09, 27.52, 25.10, 12.32, 3.31, 23.82, and 14.17 µM, respectively. Compounds 5 and 6 showed no inhibitory activities with IC 50 values higher than 50 µM. Therefore, the culture of S. hirsutum and its secondary metabolites could have a potential usage for the development of hypoglycemic drugs.
Li Bao - One of the best experts on this subject based on the ideXlab platform.
-
stucturally diverse sesquiterpenes produced by a chinese tibet fungus Stereum hirsutum and their cytotoxic and immunosuppressant activities
Organic Letters, 2015Co-Authors: Jinwei Ren, Li Bao, Yi-jian Yao, Liwei Sun, Wei Yue, Qinmiao Sun, Wenbing Yin, Hongwei LiuAbstract:Two new heterodimeric sesquiterpenes, sterhirsutins C (1) and D (2), along with eight new sesquiterpenoid derivatives, sterhirsutins E–-L (3–10), were isolated from the culture of Stereum hirsutum. The absolute configuration of 1 was assigned by a single-crystal X-ray diffraction experiment. Compounds 1 and 2 possessed an unprecedented chemical skeleton with a 5/5/5/6/9/4 fused ring system. Compound 10 is the first sesquiterpene coupled with a xanthine moiety. Compounds 1–10 showed cytotoxicity against K562 and HCT116 cell lines. Compound 9 induced autophagy in HeLa cells. Compound 5 inhibited the activation of IFNβ promoter in Sendai virus infected cells.
-
Sterhirsutins A and B, Two New Heterodimeric Sesquiterpenes with a New Skeleton from the Culture of Stereum hirsutum Collected in Tibet Plateau.
ChemInform, 2015Co-Authors: Li Bao, Jinwei Ren, Jun-jie Han, Zong-yao Zhang, Yi-jian Yao, Rui Cao, Hongwei LiuAbstract:The two new sterhirsutins A (I) and B (II), as well as the new hirsutic acids D (III) and E (IV) are isolated from Stereum hirsutum.
-
Stucturally Diverse Sesquiterpenes Produced by a Chinese Tibet Fungus Stereum hirsutum and Their Cytotoxic and Immunosuppressant Activities
2015Co-Authors: Jinwei Ren, Li Bao, Yi-jian Yao, Liwei Sun, Wei Yue, Qinmiao Sun, Wenbing Yin, Hongwei LiuAbstract:Two new heterodimeric sesquiterpenes, sterhirsutins C (1) and D (2), along with eight new sesquiterpenoid derivatives, sterhirsutins E–-L (3–10), were isolated from the culture of Stereum hirsutum. The absolute configuration of 1 was assigned by a single-crystal X-ray diffraction experiment. Compounds 1 and 2 possessed an unprecedented chemical skeleton with a 5/5/5/6/9/4 fused ring system. Compound 10 is the first sesquiterpene coupled with a xanthine moiety. Compounds 1–10 showed cytotoxicity against K562 and HCT116 cell lines. Compound 9 induced autophagy in HeLa cells. Compound 5 inhibited the activation of IFNβ promoter in Sendai virus infected cells
-
Sterhirsutins A and B, two new heterodimeric sesquiterpenes with a new skeleton from the culture of Stereum hirsutum collected in Tibet Plateau.
Organic letters, 2014Co-Authors: Li Bao, Jinwei Ren, Jun-jie Han, Zong-yao Zhang, Yi-jian Yao, Rui Cao, Hongwei LiuAbstract:Two new heterodimeric sesquiterpenes, sterhirsutins A (1) and B (2), and two new sesquiterpenes, hirsutic acids D–E (3 and 4), were identified from the culture of Stereum hirsutum. The absolute configurations in 1 and 2 were confirmed by single-crystal X-ray diffraction experiments and electronic circular dichroism (ECD) calculations. Compounds 1 and 2 are likely biosynthesized from a hirsutane-type sesquiterpene and α-humulene by a hetero-Diels–Alder cycloaddition. Compounds 1–4 showed cytotoxicity against K562 and HCT116 cell lines.
-
Sterhirsutins A and B, Two New Heterodimeric Sesquiterpenes with a New Skeleton from the Culture of Stereum hirsutum Collected in Tibet Plateau
2014Co-Authors: Li Bao, Jinwei Ren, Jun-jie Han, Zong-yao Zhang, Yi-jian Yao, Rui Cao, Hongwei LiuAbstract:Two new heterodimeric sesquiterpenes, sterhirsutins A (1) and B (2), and two new sesquiterpenes, hirsutic acids D–E (3 and 4), were identified from the culture of Stereum hirsutum. The absolute configurations in 1 and 2 were confirmed by single-crystal X-ray diffraction experiments and electronic circular dichroism (ECD) calculations. Compounds 1 and 2 are likely biosynthesized from a hirsutane-type sesquiterpene and α-humulene by a hetero-Diels–Alder cycloaddition. Compounds 1–4 showed cytotoxicity against K562 and HCT116 cell lines
Jinwei Ren - One of the best experts on this subject based on the ideXlab platform.
-
stucturally diverse sesquiterpenes produced by a chinese tibet fungus Stereum hirsutum and their cytotoxic and immunosuppressant activities
Organic Letters, 2015Co-Authors: Jinwei Ren, Li Bao, Yi-jian Yao, Liwei Sun, Wei Yue, Qinmiao Sun, Wenbing Yin, Hongwei LiuAbstract:Two new heterodimeric sesquiterpenes, sterhirsutins C (1) and D (2), along with eight new sesquiterpenoid derivatives, sterhirsutins E–-L (3–10), were isolated from the culture of Stereum hirsutum. The absolute configuration of 1 was assigned by a single-crystal X-ray diffraction experiment. Compounds 1 and 2 possessed an unprecedented chemical skeleton with a 5/5/5/6/9/4 fused ring system. Compound 10 is the first sesquiterpene coupled with a xanthine moiety. Compounds 1–10 showed cytotoxicity against K562 and HCT116 cell lines. Compound 9 induced autophagy in HeLa cells. Compound 5 inhibited the activation of IFNβ promoter in Sendai virus infected cells.
-
Sterhirsutins A and B, Two New Heterodimeric Sesquiterpenes with a New Skeleton from the Culture of Stereum hirsutum Collected in Tibet Plateau.
ChemInform, 2015Co-Authors: Li Bao, Jinwei Ren, Jun-jie Han, Zong-yao Zhang, Yi-jian Yao, Rui Cao, Hongwei LiuAbstract:The two new sterhirsutins A (I) and B (II), as well as the new hirsutic acids D (III) and E (IV) are isolated from Stereum hirsutum.
-
Stucturally Diverse Sesquiterpenes Produced by a Chinese Tibet Fungus Stereum hirsutum and Their Cytotoxic and Immunosuppressant Activities
2015Co-Authors: Jinwei Ren, Li Bao, Yi-jian Yao, Liwei Sun, Wei Yue, Qinmiao Sun, Wenbing Yin, Hongwei LiuAbstract:Two new heterodimeric sesquiterpenes, sterhirsutins C (1) and D (2), along with eight new sesquiterpenoid derivatives, sterhirsutins E–-L (3–10), were isolated from the culture of Stereum hirsutum. The absolute configuration of 1 was assigned by a single-crystal X-ray diffraction experiment. Compounds 1 and 2 possessed an unprecedented chemical skeleton with a 5/5/5/6/9/4 fused ring system. Compound 10 is the first sesquiterpene coupled with a xanthine moiety. Compounds 1–10 showed cytotoxicity against K562 and HCT116 cell lines. Compound 9 induced autophagy in HeLa cells. Compound 5 inhibited the activation of IFNβ promoter in Sendai virus infected cells
-
Sterhirsutins A and B, two new heterodimeric sesquiterpenes with a new skeleton from the culture of Stereum hirsutum collected in Tibet Plateau.
Organic letters, 2014Co-Authors: Li Bao, Jinwei Ren, Jun-jie Han, Zong-yao Zhang, Yi-jian Yao, Rui Cao, Hongwei LiuAbstract:Two new heterodimeric sesquiterpenes, sterhirsutins A (1) and B (2), and two new sesquiterpenes, hirsutic acids D–E (3 and 4), were identified from the culture of Stereum hirsutum. The absolute configurations in 1 and 2 were confirmed by single-crystal X-ray diffraction experiments and electronic circular dichroism (ECD) calculations. Compounds 1 and 2 are likely biosynthesized from a hirsutane-type sesquiterpene and α-humulene by a hetero-Diels–Alder cycloaddition. Compounds 1–4 showed cytotoxicity against K562 and HCT116 cell lines.
-
Sterhirsutins A and B, Two New Heterodimeric Sesquiterpenes with a New Skeleton from the Culture of Stereum hirsutum Collected in Tibet Plateau
2014Co-Authors: Li Bao, Jinwei Ren, Jun-jie Han, Zong-yao Zhang, Yi-jian Yao, Rui Cao, Hongwei LiuAbstract:Two new heterodimeric sesquiterpenes, sterhirsutins A (1) and B (2), and two new sesquiterpenes, hirsutic acids D–E (3 and 4), were identified from the culture of Stereum hirsutum. The absolute configurations in 1 and 2 were confirmed by single-crystal X-ray diffraction experiments and electronic circular dichroism (ECD) calculations. Compounds 1 and 2 are likely biosynthesized from a hirsutane-type sesquiterpene and α-humulene by a hetero-Diels–Alder cycloaddition. Compounds 1–4 showed cytotoxicity against K562 and HCT116 cell lines
In-gyu Choi - One of the best experts on this subject based on the ideXlab platform.
-
Biotransformation of (-)-α-Pinene by Whole Cells of White Rot Fungi, Ceriporia sp. ZLY-2010 and Stereum hirsutum.
Mycobiology, 2015Co-Authors: Su-yeon Lee, Seon-hong Kim, Chang-young Hong, Ho-young Kim, Sun-hwa Ryu, In-gyu ChoiAbstract:Two white rot fungi, Ceriporia sp. ZLY-2010 (CER) and Stereum hirsutum (STH) were used as biocatalysts for the biotransformation of (-)-α-pinene. After 96 hr, CER converted the bicyclic monoterpene hydrocarbon (-)-α-pinene into α-terpineol (yield, 0.05 g/L), a monocyclic monoterpene alcohol, in addition to, other minor products. Using STH, verbenone was identified as the major biotransformed product, and minor products were myrtenol, camphor, and isopinocarveol. We did not observe any inhibitory effects of substrate or transformed products on mycelial growth of the fungi. The activities of fungal manganese-dependent peroxidase and laccase were monitored for 15 days to determine the enzymatic pathways related to the biotransformation of (-)-α-pinene. We concluded that a complex of enzymes, including intra- and extracellular enzymes, were involved in terpenoid biotransformation by white rot fungi.
-
biotransformation of α pinene by whole cells of white rot fungi ceriporia sp zly 2010 and Stereum hirsutum
Mycobiology, 2015Co-Authors: Su-yeon Lee, Seon-hong Kim, Chang-young Hong, Ho-young Kim, Sun-hwa Ryu, In-gyu ChoiAbstract:Two white rot fungi, Ceriporia sp. ZLY-2010 (CER) and Stereum hirsutum (STH) were used as biocatalysts for the biotransformation of (-)-α-pinene. After 96 hr, CER converted the bicyclic monoterpene hydrocarbon (-)-α-pinene into α-terpineol (yield, 0.05 g/L), a monocyclic monoterpene alcohol, in addition to, other minor products. Using STH, verbenone was identified as the major biotransformed product, and minor products were myrtenol, camphor, and isopinocarveol. We did not observe any inhibitory effects of substrate or transformed products on mycelial growth of the fungi. The activities of fungal manganese-dependent peroxidase and laccase were monitored for 15 days to determine the enzymatic pathways related to the biotransformation of (-)-α-pinene. We concluded that a complex of enzymes, including intra- and extracellular enzymes, were involved in terpenoid biotransformation by white rot fungi.
-
Biodegradation of methoxychlor and its metabolites by the white rot fungus Stereum hirsutum related to the inactivation of estrogenic activity.
Journal of Environmental Science and Health Part B: Pesticides Food Contaminants and Agricultural Wastes, 2006Co-Authors: Soo-min Lee, Jae-won Lee, Ki-ryeong Park, Eui-ju Hong, Eui-bae Jeung, Myungkil Kim, Ha-young Kang, In-gyu ChoiAbstract:The white rot fungus Stereum hirsutum was used to degrade methoxychlor [2,2,2-trichloro-1,1-bis(4-methoxyphenyl)ethane] in culture and the degraded products were extensively determined. The estrogenic activity of the degraded products of methoxychlor was examined using cell proliferation and pS2 gene expression assays in MCF-7 cells. S. hirsutum showed high resistance to methoxychlor 100 ppm, and the mycelial growth was fully completed within 8 days of incubation at 30°C. Methoxychlor in liquid culture medium was gradually converted into 2,2-dichloro-1,1-bis(4-methoxyphenyl)ethane, 2,2-dichloro-1,1-bis(4-methoxyphenyl)ethylene, 2-chloro-1,1-bis(4-methoxyphenyl) ethane, 2-chloro-1,1-bis(4-methoxyphenyl) ethylene, and 1,1-bis(4-methoxyphenyl)ethylene, indicating that methoxychlor is dominantly degraded by dechlorination and dehydrogenation. MCF-7 cells were demonstrated to proliferate actively at the 10−5 M concentration of methoxychlor. However, cell proliferation was significantly inhibited by the incubat...
-
Biodegradation of methoxychlor and its metabolites by the white rot fungus Stereum hirsutum related to the inactivation of estrogenic activity.
Journal of environmental science and health. Part. B Pesticides food contaminants and agricultural wastes, 2006Co-Authors: Soo-min Lee, Jae-won Lee, Ki-ryeong Park, Eui-ju Hong, Eui-bae Jeung, Myungkil Kim, Ha-young Kang, In-gyu ChoiAbstract:The white rot fungus Stereum hirsutum was used to degrade methoxychlor [2,2,2-trichloro-1,1-bis(4-methoxyphenyl)ethane] in culture and the degraded products were extensively determined. The estrogenic activity of the degraded products of methoxychlor was examined using cell proliferation and pS2 gene expression assays in MCF-7 cells. S. hirsutum showed high resistance to methoxychlor 100 ppm, and the mycelial growth was fully completed within 8 days of incubation at 30 degrees C. Methoxychlor in liquid culture medium was gradually converted into 2,2-dichloro-1,1-bis(4-methoxyphenyl)ethane, 2,2-dichloro-1,1-bis(4-methoxyphenyl)ethylene, 2-chloro-1,1-bis(4-methoxyphenyl) ethane, 2-chloro-1,1-bis(4-methoxyphenyl) ethylene, and 1,1-bis(4-methoxyphenyl)ethylene, indicating that methoxychlor is dominantly degraded by dechlorination and dehydrogenation. MCF-7 cells were demonstrated to proliferate actively at the 10-5 M concentration of methoxychlor. However, cell proliferation was significantly inhibited by the incubation with methoxychlor culture media containing S. hirsutum. In addition, the expression level of pS2 mRNA was increased at the concentration (10-5 M) of methoxychlor. The reductive effect of S. hirsutum for methoxychlor was clear but not significant as in the proliferation assay.
-
Degradation of bisphenol A by white rot fungi, Stereum hirsutum and Heterobasidium insulare, and reduction of its estrogenic activity.
Biological & pharmaceutical bulletin, 2005Co-Authors: Soo-min Lee, Eui-bae Jeung, Bon-wook Koo, Joon-weon Choi, Don-ha Choi, In-gyu ChoiAbstract:Two lignin-degrading basidiomycetes, Stereum hirsutum and Heterobasidium insulare, were used to degrade bisphenol A (BPA) in culture, and the estrogenic activity of the degradation products was examined using MCF7 cell proliferation assays (E-screen) and analysis of pS2 mRNA expression in MCF 7 cells. Both S. hirsutum and H. insulare showed high resistance to BPA 100 ppm, and their mycelial growth was fully completed within 8 d of incubation at 30 °C. It took 7 to 14 d to achieve complete degradation (ca. 99%) of BPA by both fungi. MCF-7 cells proliferated actively at a BPA concentration of 10 � 5 M. However, cell line proliferation was significantly inhibited when the cells were incubated in BPA culture media containing S. hirsutum and H. insulare. Similar results were obtained regarding pS2 mRNA expression. The pS2 mRNA expression levels decreased by 1.5-fold in supernatant from BPA treated with S. hirsutum and H. insulare compared with those treated with BPA alone.
Yi-jian Yao - One of the best experts on this subject based on the ideXlab platform.
-
stucturally diverse sesquiterpenes produced by a chinese tibet fungus Stereum hirsutum and their cytotoxic and immunosuppressant activities
Organic Letters, 2015Co-Authors: Jinwei Ren, Li Bao, Yi-jian Yao, Liwei Sun, Wei Yue, Qinmiao Sun, Wenbing Yin, Hongwei LiuAbstract:Two new heterodimeric sesquiterpenes, sterhirsutins C (1) and D (2), along with eight new sesquiterpenoid derivatives, sterhirsutins E–-L (3–10), were isolated from the culture of Stereum hirsutum. The absolute configuration of 1 was assigned by a single-crystal X-ray diffraction experiment. Compounds 1 and 2 possessed an unprecedented chemical skeleton with a 5/5/5/6/9/4 fused ring system. Compound 10 is the first sesquiterpene coupled with a xanthine moiety. Compounds 1–10 showed cytotoxicity against K562 and HCT116 cell lines. Compound 9 induced autophagy in HeLa cells. Compound 5 inhibited the activation of IFNβ promoter in Sendai virus infected cells.
-
Sterhirsutins A and B, Two New Heterodimeric Sesquiterpenes with a New Skeleton from the Culture of Stereum hirsutum Collected in Tibet Plateau.
ChemInform, 2015Co-Authors: Li Bao, Jinwei Ren, Jun-jie Han, Zong-yao Zhang, Yi-jian Yao, Rui Cao, Hongwei LiuAbstract:The two new sterhirsutins A (I) and B (II), as well as the new hirsutic acids D (III) and E (IV) are isolated from Stereum hirsutum.
-
Stucturally Diverse Sesquiterpenes Produced by a Chinese Tibet Fungus Stereum hirsutum and Their Cytotoxic and Immunosuppressant Activities
2015Co-Authors: Jinwei Ren, Li Bao, Yi-jian Yao, Liwei Sun, Wei Yue, Qinmiao Sun, Wenbing Yin, Hongwei LiuAbstract:Two new heterodimeric sesquiterpenes, sterhirsutins C (1) and D (2), along with eight new sesquiterpenoid derivatives, sterhirsutins E–-L (3–10), were isolated from the culture of Stereum hirsutum. The absolute configuration of 1 was assigned by a single-crystal X-ray diffraction experiment. Compounds 1 and 2 possessed an unprecedented chemical skeleton with a 5/5/5/6/9/4 fused ring system. Compound 10 is the first sesquiterpene coupled with a xanthine moiety. Compounds 1–10 showed cytotoxicity against K562 and HCT116 cell lines. Compound 9 induced autophagy in HeLa cells. Compound 5 inhibited the activation of IFNβ promoter in Sendai virus infected cells
-
Sterhirsutins A and B, two new heterodimeric sesquiterpenes with a new skeleton from the culture of Stereum hirsutum collected in Tibet Plateau.
Organic letters, 2014Co-Authors: Li Bao, Jinwei Ren, Jun-jie Han, Zong-yao Zhang, Yi-jian Yao, Rui Cao, Hongwei LiuAbstract:Two new heterodimeric sesquiterpenes, sterhirsutins A (1) and B (2), and two new sesquiterpenes, hirsutic acids D–E (3 and 4), were identified from the culture of Stereum hirsutum. The absolute configurations in 1 and 2 were confirmed by single-crystal X-ray diffraction experiments and electronic circular dichroism (ECD) calculations. Compounds 1 and 2 are likely biosynthesized from a hirsutane-type sesquiterpene and α-humulene by a hetero-Diels–Alder cycloaddition. Compounds 1–4 showed cytotoxicity against K562 and HCT116 cell lines.
-
Sterhirsutins A and B, Two New Heterodimeric Sesquiterpenes with a New Skeleton from the Culture of Stereum hirsutum Collected in Tibet Plateau
2014Co-Authors: Li Bao, Jinwei Ren, Jun-jie Han, Zong-yao Zhang, Yi-jian Yao, Rui Cao, Hongwei LiuAbstract:Two new heterodimeric sesquiterpenes, sterhirsutins A (1) and B (2), and two new sesquiterpenes, hirsutic acids D–E (3 and 4), were identified from the culture of Stereum hirsutum. The absolute configurations in 1 and 2 were confirmed by single-crystal X-ray diffraction experiments and electronic circular dichroism (ECD) calculations. Compounds 1 and 2 are likely biosynthesized from a hirsutane-type sesquiterpene and α-humulene by a hetero-Diels–Alder cycloaddition. Compounds 1–4 showed cytotoxicity against K562 and HCT116 cell lines