111205-12-0 23-De((6-deoxy-2,3-di-O-methyl-beta-D-allopyranosyl)oxy)-12,13-epoxy-12,13-dihydrotylosin Antibiotic M 119a M 119-a M-119-a M1190a Tylosin, 23-de((6-deoxy-2,3-di-O-methyl-beta-D-allopyranosyl)oxy)-12,13-epoxy-12,13-dihydro-