
%0 Journal Article
%A Cheung, H 
%A Yan, T 
%T Constituents of Dipterocarpaceae Resins. IV. Triterpenes of <I>Shorea acuminata</I> and <I>S. resina-nigra</I>
%J Australian Journal of Chemistry
%D 1972/09/01
%V 25
%N 9
%P 2003-2012
%K 
%R https://doi.org/10.1071/CH9722003
%U https://www.publish.csiro.au/paper/CH9722003 
%X Application of N.M.R. methyl resonance data led to revision of the structures given to the two cis 2,3-diols resulting from osmium tetroxide oxidation of methyl oleana-2,12-dien-28-oate (10). 2&#945;,3&#945;-Dihydroxyolean-l2-en-28-oic acid (6a), a new natural product, occurs in Shorea acuminata resin. Other constituents are 2&#945;-hydroxy-ursolic acid (14a), mangiferonic acid (15b), and asiatic acid (14c). S. resina-nigra contains &#946;-amyrin (16a), ursolaldehyde (14f), and &#936;-taraxesterol(17a). 
