Constituents of Eremurus chinensis

A novel bianthraquinone glycoside, 8-O-beta-D-glucopyranosyl-1,1',8'-trihyd roxy-3,3'-dimethyl-2,7'-bianthraquinone (1); two naphthalene derivatives, 2 -acetyl-1-hydroxy-8-methoxy-3-methylnaphthalene (2) and 2-acetyl-1,8-dimeth oxy-3-methylnaphthalene (3); and a novel pre-anthraquinone, 1-oxo-4(S),9-di hydroxy-8-methoxy-6-hydroxymethyl-1,2,3,4-tetrahydroanthracene (4), were is olated from Eremurus chinensis. Their structures were established by spectr oscopic and chemical methods. In addition, the known compounds chrysophanol , chrysophanol 8-methyl ether, aloesaponol III 8-methyl ether(5), and 10-(c hrysophanol-7'-yl)-10-hydroxychrysophanol-9-anthrone were also isolated and identified from this plant.