topopyrone C A naphthochromene that is 4H-naphtho[2,3-h]chromene-4,7,12-trione substituted by hydroxy groups at positions 5, 9 and 11 and a methyl group at position 2. It is isolated from fungal strains Phoma and Penicillium and acts as an inhibitor of the enzyme topoisomerase I. |
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