title: Cucurbitane and hexanorcucurbitane glycosides from the fruits of Cucurbita pepo cv dayangua.
abstract: Phytochemical investigation of the fruits of Cucurbita pepo cv dayangua has led to the isolation of two cucurbitane glycosides: cucurbitacin L 2-O-beta-D-glucopyranoside (1), cucurbitacin K 2-O-beta-D-glucopyranoside (2) and two hexanorcucurbitane glycosides: 2,16-dihydroxy-22,23,24,25,26,27-hexanorcucurbit-5-en-11,20-dione 2-O-beta-D-glucopyranoside (3) and 16-hydroxy-22,23,24,25,26,27-hexanorcucurbit-5-en-11,20-dione 3-O-alpha-L-rhamnopyranosyl-(1 --> 2)-beta-D-glucopyranoside (4). Compounds 1, 2 and 3 were isolated from Cucurbita genus for the first time, while compound 4 is a new one. Their structures were determined on the basis of chemical and spectroscopic evidence.
authors: School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shengyang, China.
authors: Da-Cheng
authors: DC
authors: Wang
authors: Hong-Yu
authors: HY
authors: Pan
authors: Xu-Ming
authors: XM
authors: Deng
authors: Hua
authors: H
authors: Xiang
authors: Hui-Yuan
authors: HY
authors: Gao
authors: Hui
authors: H
authors: Cai
authors: Li-Jun
authors: LJ
authors: Wu
mesh_terms: D002236:Carbohydrate Conformation; D028464:Cucurbita / Q000737:chemistry*; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D021241:Spectrometry, Mass, Electrospray Ionization; D013055:Spectrophotometry, Infrared; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D006027:Glycosides; D014315:Triterpenes; C514277:cucurbitane