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Chemical structure of AA and AA-PMe. (A) 2α,3β,23-Trihydroxyurs-12-ene-28-oic acid, AA; C30H48O5, MW 488.70 g/mol; (B) N-(2 α,3β,23-acetoxyurs-12-en-28-oyl)-L-proline methyl ester, AA-PMe; C42H63NO9, MW 725.95 g/mol.
Abbreviations: AA, asiatic acid; MW, molecular weight.
