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The structures of PF1092A (1), B (2) and C (3), new nonsteroidal progesterone receptor ligands produced by Penicillium oblatum, were elucidated by spectroscopic analyses. These compounds possess an eremophilane-type sesquiterpene carbon skeleton and differ only in that 1 and 2 are different monoacetates of 3. The absolute configurations of 1-3 were determined by single crystal X-ray diffraction analysis of the 4-bromobenzoyl ester of PF1092A and by measuring the optical rotations of the acetylation products of these compounds.

journal of antibiotics

PF1092A, B and C, New Nonsteroidal Progesterone Receptor Ligands Produced by Penicillium oblatum. II. Physico-chemical Properties and Structure Elucidation.