34379-06-1 546-57-6 Erythralosamine Erythromycin, 3-O-de(2,6-dideoxy-3-C-methyl-3-O-methyl-alpha-L-ribo-hexopyranosyl)-10,11-didehydro-9-deoxo-6,11,12-trideoxy-6,9:9,12-diepoxy-