Coprophilin: An Anticoccidial Agent Produced by a Dung Inhabiting Fungus.

Coprophilin, a decalin pentanedienoic acid methyl ester, was isolated from an unidentified fungus by bioassay guided separation. It inhibited (MIC = 1.5 μM) the growth of Eimeria tenella in an in vitro assay. The isolation, structure elucidation, absolute stereochemistry and biology are described.