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It has a hydroxyl functional group on carbon 10, whereas paclitaxel has an acetate ester, and a tert-butyl carbamate ester exists on the phenylpropionate side chain instead of the benzyl amide in paclitaxel. Sigma gamma rho sorority, inc. Epimedium, otherwise known as horny goat weed, is an herb that alternative medicine practitioners tout as an aphrodisiac.