Maytansinoids

Abstract

Novel Antibiotic C-15003PND, which has the formula: ##STR1## wherein R represents hydrogen, --CO--CH.sub.3, --CO--CH.sub.2 --CH.sub.3, ##STR2## is produced by cultivating a microorganism of the genus Nocardia. The Antibiotic C-15003PND wherein R is acetyl, propionyl, isobutyryl or isovaleryl is useful for an antifungal, antiprotozoal or antitumor agent and Antibiotic C-15003PND wherein R is hydrogen is useful for an intermediate thereof.

Dependencies are inferred from the claim text.