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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.

Department of Chemistry, Bose Institute, Calcutta-700 009. Manuscript received 23 August 1977, accepted 24 February 1978 Further Studies on the Structure and Stereochemistry of Entagenic acid.

Triterpenoids. XXXIV The Structure and Stereochemistry of Entagenic Acid

Department of Chemistry, Bose Institute, Calcutta-9 Received 14 January 1972 The isolation of a new triterpene acid called Acid-A from the branch wood of Barringtonia acutangula Gaertn was reported in our preliminary communicationand it was shown to be 2,3,19-trihydroxyolean-12-ene-23 (or 24), 28-dioic acid. Further studies on the constitution of this acid, now called barrinic acid (Ia), is reported here.

Triterpenoids-XXX. The Structure of Barringtogenol E---A New Triterpenoid Sapogenol from Barringtonia acutangula Gaertn.

Chemical Examination of \(Streblus\) \(asper\).