CFL50B: Cefalexin Diketopiperazine Impurity

2-(3,6-Dioxo-5-phenyl-2-piperazinyl)-3,6-dihydro-5-methyl-2H-1,3-thiazine-4-carboxylic acid ;

CAS # 59865-11-1 ;

C16H17N3O4S (base) ; Mol. Wt.: 347.39 ;

C16H18ClN3O4S (HCl) ; Mol. Wt.: 383.85 ;