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The structure of TAN-931, a novel nonsteroidal aromatase inhibitor, was determined by chemical reactions and spectral analyses including 2D NMR experiments to be 4-(2,6-dihydroxybenzoyl)-3-formyl-5-hydroxybenzoic acid. Several derivatives of TAN-931 were prepared, and it was found that the 3-formyl and 2'- and/or 6'-hydroxyl groups play an important role in its inhibitory activity. Among the compounds synthesized, 4-(2,6-dihydroxybenzoyl)-3-formyl-5-methoxy-N,N-dimethyl-benzamide was found to be more effective than TAN-931 when administered orally.

journal of antibiotics

TAN-931, a novel nonsteroidal aromatase inhibitor produced by Penicillium funiculosum No.8974. II. Structure elucidation, chemical modification and biological activity.