2',3-Daem 57917-99-4 Erythralosamine-2',3-diacetate Erythromycin, 3-O-acetyl-3-O-de(2,6-dideoxy-3-C-methyl-3-O-methyl-alpha-L-ribohexopyranosyl)-10,11-didehydro-9-deoxo-6,11,12-trideoxy-6,9:9,12-diepoxy-, 2'-acetate