The structure of salaspermic acid, isolated from Salacia macrosperma Wight., has been shown to be 24-hydroxyfriedelan-3-on-29-oic acid hemiacetal (1a) by an X-ray study of the compound (3) obtained from the acid by a sequence of reactions leading to enlargement of ring E.
D. Rogers, K. A. Woode, N. Viswanathan and B. S. Joshi, J. Chem. Soc., Chem. Commun., 1980, 1049 DOI: 10.1039/C39800001049
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