
TY  - JOUR
A1  - Cheung, H 
A1  - Yan, T 
T1  - Constituents of Dipterocarpaceae Resins. IV. Triterpenes of <I>Shorea acuminata</I> and <I>S. resina-nigra</I>
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1972
VL  - 25
IS  - 9
SP  - 2003
EP  - 2012
KW  - 
UR  - https://doi.org/10.1071/CH9722003 
N2  - 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). 
ER  -

