roxithromycin , formerly known as ru 28965 ( 9- [ o [ ( 2-methoxyethoxy ) methyl ] oxime ] -erythromycin ) , is a novel 14 atom-membered semisynthetic macrolide with an antibacterial spectrum directed towards gram-positive cocci and bacilli , gram-negative cocci and some parvobacteriaceae .
C0035891
roxithromycin
C0014806
erythromycin