title: Fortisterol, a novel steroid with an unusual seven-membered lactone ring B from the Chinese marine sponge Biemna fortis Topsent.
abstract: Fortisterol (1), a novel steroid with a rare seven-membered lactone ring B, has been isolated from the marine sponge Biemna fortis and its structure gas been elucidated on the basis of spectroscopic data.
authors.affiliation: Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, State Key Laboratory of Drug Research, Shanghai 201203, China.
authors.forename: X-C
authors.initials: XC
authors.lastname: Huang
authors.forename: Y-W
authors.initials: YW
authors.lastname: Guo
authors.forename: G-Q
authors.initials: GQ
authors.lastname: Song
mesh_terms: D000818:Animals; D007783:Lactones / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D011161:Porifera / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D013056:Spectrophotometry, Ultraviolet; D013256:Steroids / Q000737:chemistry*
chemical_list: D007783:Lactones; D013256:Steroids; C514640:fortisterol