(R)-2-((R)-Carboxy((Z)-2-(ethoxyimino)-2-(5-(phosphonoamino)-1,2,4-thiadiazol-3-yl)acetamido)methyl)-5-((4-(1-methylpyridin-1-ium-4-yl)thiazol-2-yl)thio)-3,6-dihydro-2H-1,3-thiazine-4-carboxylate is an impurity of Ceftaroline Fosamil (C243970), a cephalosporin antibiotic. It is active against methicillin-resistant Staphylococcus aureus (MRSA) and Gram-positive bacteria.
