Diospyros ebenum

About one hundred ursanes have been obtained from nature so far. Most important of these is ursolic acid (540), first isolated in 1854 from leaves of Arc-tostaphylos uva-ursi. It is widely distributed in nature and has been mostly obtained from leaves and fruits, but has also been isolated from the bark of certain trees - e.g., Olearia paniculata and Betula pendula (207, 228). As already mentioned, a-amyrin (539) occurs together with 8-amyrin in Manila elemi resin, a-Amyrenone (the ketone corresponding to 539) occurs in the heartwood of Diospyros ebenum (174). ll)8-Hydroxy-a-amyrin has been isolated from black dammar, the resinous exudate of Canarium strictum (198). Other important members are 8-boswellic acid (541) from the oleoresin from Boswellia spp., and asiatic acid (542) first isolated from the leaves of Centella asiatica but also present in dammar resin (109, 228). 11-Oxoasiatic acid is a component of the resin from... 

Gupta R K, Mahadevan V 1967 Chemical examination of the heartwood of Diospyros ebenum. Indian J Pharm 29 289-291... 

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