英文别名2-(3,6-dioxo-5-phenylpiperazin-2-yl)-5-methyl-3,6-dihydro-2H-1,3-thiazine-4-carboxylic acid; Cephalexin Diketopiperazine; 2-(3,6-Dioxo-5-phenyl-2-piperazinyl)-3,6-dihydro-5-Methyl-2H-1,3-thiazine-4-carboxylic Acid; Cefalexin Diketopiperazine Impurity; Cephalexin Impurity 7; Cephalexin diketopiperazine Impurity 
