73047-31-1 BRN 1615989 Desmycarosyl-angolamycin Staphcoccomycin Tylosin, 12,13-dihydro-4(sup A)-O-de(2,6-dideoxy-3-C-methyl-alpha-L-ribo-hexopyranosyl)-2(sup A)-deoxy-12,13-epoxy- Tylosin, 4A-O-de(2,6-dideoxy-3-C-methyl-alpha-L-ribo-hexopyranosyl)-2A-deoxy-12,13-epoxy-12,13-dihydro-