title: Sesquiterpenes and other constituents from the aerial parts of Inula japonica.
abstract: Three new sesquiterpenes, 1beta-hydroxy-8beta-acetoxycostic acid methyl ester, 1beta-hydroxy-8beta-acetoxyisocostic acid methyl ester and 1beta-hydroxy-4alpha,11alpha-eudesma-5-en-12,8beta-olide, along with fourteen known compounds were isolated from the aerial parts of Inula japonica. The structures of these new compounds were elucidated by spectroscopic methods (IR, EIMS, HRMS, 1D and 2D NMR). 1,6alpha-dihydroxy-4alphaH-1,10-secoeudesma-5(10),11(13)-dien-12,8beta-olide exhibited appreciable cytotoxic activity against cultured SMMC-7721 (human hepatoma cell) and HO-8910 (human ovarian carcinoma cell) with IC 50 values of 52.22 and 21.32 microg/mL, while 5alphaH-eudesma-4(15),11(13)-dien-12,8beta-olide showed remarkable cytotoxic activity against cultured SMMC-7721 and HO-8910 with IC 50 values of 6.21 and 5.28 microg/mL, respectively.
authors.affiliation: Department of Chemistry, National Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, People's Republic of China.
authors.forename: Chao
authors.initials: C
authors.lastname: Yang
authors.forename: Chun-Ming
authors.initials: CM
authors.lastname: Wang
authors.forename: Zhong-Jian
authors.initials: ZJ
authors.lastname: Jia
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000302:isolation & purification* / Q000494:pharmacology; D002460:Cell Line; D002681:China; D004354:Drug Screening Assays, Antitumor; D038143:Inula / Q000737:chemistry*; D035261:Plant Components, Aerial / Q000737:chemistry; D012717:Sesquiterpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D012717:Sesquiterpenes