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n4freepatentsonline.
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isa:67922239
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The composition according to claim 1 wherein said ester or ether of betulin is a compound according to the formula: Wherein R3 is an optionally substituted acyl group containing from 1 to about 32 carbon atoms and is present in the composition in the range of about 0.01 to about 50 percent by weight of said composition. 6.
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