The University of North Carolina at Chapel Hill

Biotech Research Labs, Inc.

Fumio Hashimoto

Kuo-Hsiung Lee

Yoshiki Kashiwada

Mark Manak

Louis Mark Cosentino

Some betulinic acid and dihydrobetulinic acid acyl derivatives according to the present invention have been found to have potent anti-HIV activity. Introducing a C.sub.2 -C.sub.20 substituted or unsubstituted acyl group at the C.sub.3 -hydroxy group of betulinic acid and dihydrobetulinic acid produces the corresponding 3-O-acyl derivatives. The compounds of the present invention have the following formulae: ##STR1## where R may be a mono- or dicarboxylacyl group, substituted or unsubstituted, of from about 2 to about 20 carbon atoms, and R' may be hydrogen or a C.sub.2 -C.sub.10 substituted and unsubstituted alkyl or aryl group.

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Kumamoto, Japan

Fumio Hashimoto