title: New 24-isopropylcholesterol and 24-isopropenylcholesterol sulfate from the marine sponge Epipolasis species.
abstract: Two novel steroids, polasterol A (1) and polasterol B sulfate (2), along with two known compounds, 22(E),24-isopropylcholesta-5, 22-dien-3 beta-ol (3) and halistanol sulfate (4), have been isolated from the Japanese marine sponge Epipolasis sp. The structures of 1 and 2 were determined as 3 beta-hydroxy-24-isopropylcholesta-5, 22(E)-dien-7-one and 24xi-isopropenylcholesta-22(Z), 28(29)-diene-2 beta,3 alpha,6 alpha-triyl trisodium sulfate on the basis of spectroscopic investigations and a chemical conversion.
authors.affiliation: Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima 770-8514, Japan. umeyama@ph.bunri-u.ac.jp
authors.forename: A
authors.initials: A
authors.lastname: Umeyama
authors.forename: K
authors.initials: K
authors.lastname: Adachi
authors.forename: S
authors.initials: S
authors.lastname: Ito
authors.forename: S
authors.initials: S
authors.lastname: Arihara
mesh_terms: D000818:Animals; D002784:Cholesterol / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification; D002850:Chromatography, Gel; D008401:Gas Chromatography-Mass Spectrometry; D007564:Japan; D009682:Magnetic Resonance Spectroscopy; D009904:Optical Rotation; D011161:Porifera / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013256:Steroids / Q000737:chemistry / Q000302:isolation & purification
chemical_list: D013256:Steroids; C414472:polasterol A; C414473:polasterol B; D002784:Cholesterol