8,9-Didehydro-N-demethyl-9-deoxo-6-deoxy-6,9-epoxyerythromycin 98641-05-5 De-(N-methyl)-8,9-anhydroerythromycin A 6,9-hemicetal Erythromycin, 8,9-didehydro-N-demethyl-9-deoxo-6-deoxy-6,9-epoxy- ME 34 ME-34