ERYTHROMYCIN, 3-DE[(2,6-DIDEOXY-3-C-METHYL-3-O-METHYL-A-L-RIBO-HEXOPYRANOSYL)OXY]-10,11-DIDEHYDRO-11-DEOXY-6-O-METHYL-3-OXO-, 2'-ACETATE, (10E)- (9CI)