THE ANTIBIOTIC XK-41 COMPLEX. I

PRODUCTION, ISOLATION AND CHARACTERIZATION

Abstract

An antibiotic XK-41 complex consisting of five components (A₁, A₂, B₁ B₂, and C) produced by a new species named Micromonospora inositola MK-41 was isolated. The components, A₁, A₂, B₁ and C, were found to be macrolide-type antibiotics similar to megalomicins, while one component XK-41-B₂ was considered to be a new antibiotic probably belonging to megalomicin-group antibiotic. Erythronolide B was also found to be produced as a byproduct by this Micromonospora sp.