title: New cytotoxic steroids from the fruits of Syzygium siamense.
abstract: A new sterol, stigmast-5-ene-3beta,17alpha-diol (1), together with six known compounds, stigmast-5-ene-3beta-yl formate (2), stigmast-5-ene-3beta,7alpha-diol (3), stigmast-5-ene-7alpha-methoxy-3beta-ol (4), stigmast-5-ene-3-one (5), 3beta-sitostanol (6), and 3beta-sitosterol (7), was isolated from the fruits of Syzygium siamense, of which compound 2 is reported for the first time from a natural source. Their structures were elucidated by spectroscopic methods. The isolated compounds (1-7) were evaluated for their cytotoxic activities against human oral epidermoid carcinoma cancer (KB), human breast cancer (BC), and human small cell lung cancer (NCI-H187) cell lines.
authors.affiliation: Faculty of Science and Industrial Technology, Prince of Songkla University, Suratthani, Thailand. parinuchc@hotmail.com
authors.forename: Parinuch
authors.initials: P
authors.lastname: Chumkaew
authors.forename: Shigeru
authors.initials: S
authors.lastname: Kato
authors.forename: Kan
authors.initials: K
authors.lastname: Chantrapromma
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D004354:Drug Screening Assays, Antitumor; D005638:Fruit / Q000737:chemistry*; D006801:Humans; D007624:KB Cells; D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*; D013237:Stereoisomerism; D013265:Stigmasterol / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D027842:Syzygium / Q000737:chemistry*; D013785:Thailand
chemical_list: D000972:Antineoplastic Agents, Phytogenic; C549906:stigmast-5-ene-3beta,17-diol; D013265:Stigmasterol