Synonyms: Mikamycin A(6CI,8CI); Ostreogrycin A (7CI); Virginiamycin M1; Antibiotic PA 114A;Antibiotic PA 114A1; Factor M; Factor M (antibiotic); NSC 244426; NSC 87432; PA114A; Pristinamycin II; Pristinamycin IIA; RP 12536; Staphylomycin M1;Streptogramin A; Vernamycin A;[3R-(3R*,4R*,5E,10E,12E,14S*)]-8,9,14,15,24,25-Hexahydro-14-hydroxy-4,12-dimethyl-3-(1-methylethyl)-3H-21,18-nitrilo-1H,22H-pyrrolo[2,1-c][1,8,4,19]dioxadiazacyclotetracosine-1,7,16,22(4H,17H)-tetrone