title: Ambuic acid and torreyanic acid derivatives from the endolichenic fungus Pestalotiopsis sp.
abstract: Six new ambuic acid (1) derivatives (2-7) and a new torreyanic acid analogue (8) have been isolated from the crude extract of endophytic fungus Pestalotiopsis sp. inhabiting the lichen Multiclavula [corrected] sp. The structures of these compounds were elucidated primarily by NMR and MS methods, and their absolute configurations were assigned by application of the CD excitation chirality method. Compounds 1 and 2 displayed antimicrobial activity against the Gram-positive bacterium Staphylococcus aureus.
authors.affiliation: Key Laboratory of Systematic Mycology & Lichenology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100080, People's Republic of China.
authors.forename: Gang
authors.initials: G
authors.lastname: Ding
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Shaobin
authors.initials: S
authors.lastname: Fu
authors.forename: Shuchun
authors.initials: S
authors.lastname: Liu
authors.forename: Jiangchun
authors.initials: J
authors.lastname: Wei
authors.forename: Yongsheng
authors.initials: Y
authors.lastname: Che
mesh_terms: D001203:Ascomycota / Q000737:chemistry*; D001232:Aspergillus fumigatus / Q000187:drug effects; D002176:Candida albicans / Q000187:drug effects; D002681:China; D003512:Cyclohexanones / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D004852:Epoxy Compounds / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D004926:Escherichia coli / Q000187:drug effects; D005848:Geotrichum / Q000187:drug effects; D008011:Lichens / Q000382:microbiology; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D011809:Quinones / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D013211:Staphylococcus aureus / Q000187:drug effects; D013296:Streptococcus pneumoniae / Q000187:drug effects
chemical_list: D003512:Cyclohexanones; D004852:Epoxy Compounds; D011809:Quinones; C429363:ambuic acid; C474396:torreyanic acid