Analysis of Chemical Constituents of Guangdong Liangcha

In order to analyze chemical constituents and quality standard of Guangdong Liangcha,five glycosides were isolated.Their structures were determined to be 4-p-cumaroyl-D-glucose(1),2α,3α,19α-trihydroxyursa-12-en-28-oic acid β-D-glucopyranosyl ester(2),2α,3β,19α-trihydroxyursa-12-en-28-oic acid β-D-glucopyranosyl ester(3),2α,3β,19α,23-tetrahydroxyurs-12-en-28-oic acid β-D-glucopyranosyl ester(4),6-C-glycopyr-anosyl luteolin(5) by spectroscopic analysis.Compound 1 was firstly obtained as a natural product,and compounds 1,2,3,4,5 were also firstly obtained from Guangdong Liangcha,which was contributed to further mechanism of bioactivity.