The Structure and Stereochemistry of Entagenic Acid

Department of Chemistry, Bose Institute, Calcutta-700 009 Manuscript received 2 April 1983, accepted 15 September 1983 The structure of entagenic acid, a new triterpene acid sapogenin from the kernel of the seeds of \(Entada\) \(phaseoloides\) Merrill, has now been confirmed as 3β,15\(\propto\),16\(\propto\)- trihydroxy-olean-12-ene-28-oic acid (IIa). The experiments leading to this structure are presented.