12,13-Deepoxy-12,13-didehydro-3-(sup B)-O-demethylmycinamicin I 73684-70-5 Antibiotic A 11725 III Mycinamicin I, 12,13-deepoxy-12,13-didehydro-3(sup B)-O-demethyl- Mycinamicin III Mycinomycin III