Novel serotonin inhibitors and pharmaceutical compositions containing them, and microbiological processes and organisms for the production thereof.

摘要

Novel physiologically active substances KS-501 and KS-502 of the formula : <CHEM> wherein R is hydrogen or carboxyl having inhibitory activity on serotonin release from platelets and/or platelet aggregation are produced by culturing a microorganism of the genus Sporothrix.