Abstract The ether extract of Ricinocarpus stylosus has yielded polyalthic acid, three new naturally occurring flavonoid pigments and four new kauranoid diterpenes. The latter have been shown to be 16α-(-)-kauran-l7, 19-dioic acid (I; R, R'= CO 2 H), 19-hydroxy-16α-(-)- kauran-17-oic acid (I; R= CH 2 OH, R'= CO 2 H), kauran-16α,-17, 19-triol (III; R, R'= CH 2 OH) and (-)-kaur-16-en-19-oic acid (IV; R= CO 2 H). The NMR correlations of these ...
![(4R,4aS,6aS,8R,11aR,11bS)-4,11b-dimethyltetradecahydro-6a,9-methanocyclohepta[a]naphthalene-4,8-dicarboxylic acid结构式](https://image.chemsrc.com/caspic/411/10244-92-5.png)
