has role Mycoplasma genitalium metabolite secondary carboxamide tertiary carboxamide pyrroline lactam macrolide antibiotic secondary alcohol antibacterial drug cyclic ketone 1,3-oxazoles enamide pristinamycin IIA Virginiamycin M1 Ostreogrycin a chebi_ontology CHEBI:46395 Virginiamycin factor M1 Streptogramin A Mikamycin A CHEBI:9997 A macrolide that is (together with pristinamycin IA) a component of pristinamycin, an oral streptogramin antibiotic produced by <em>Streptomyces pristinaespiralis</em>. Pristinamycin exhibits bactericidal activity against Gram positive organisms including methicillin-resistant <em>Staphylococcus aureus</em>.