PHYSIOLOGICALLY ACTIVE SUBSTANCE P-23924, ITS PRODUCTION AND USE

摘要

The compound of the formula: wherein R1 is hydrogen, methyl or hydroxymethyl, R2 is hydrogen or methoxy, R3 is hydroxy or methoxy, and R4 is hydrogen or a group is novel, and the compound is of use as inhibitors of animal tissue fibrosis, or biochemical reagents. The compound of the above formula wherein R4 is a group may be produced by cultivating a microorganism belonging to the genus Streptomyces and capable of producing the compound, and the compound of the formula wherein R4 is hydrogen may be produced by replacing the group with a hydrogen atom by reduction.