Six new triterpenoids, 3β,23,24-trihydroxyolean-12-en-28-oic acid ( 1 ), 3β,6β,24-trihydroxyolean-12-en-28-oic acid ( 2 ), 3β,6β,19α,24-tetrahydroxyurs-12-en-28-oic acid ( 3 ), cincholic acid 3β- O -β- d -fucopyranoside ( 4 ), pyrocincholic acid 3β,- O -β- d -fucopyranoside ( 5 ), and pyrocincholic acid 3β- O -α- l -rhamnopyranoside ( 6 ) were isolated from the roots of Adina rubella . Their structures were elucidated by spectral analysis. The 13 C NMR signals of 5 and 6 were assigned by 2D-NMR experiments.
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Fang et al. (1996) studied this question.
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