Diketopiperazines of ampicillinAXS6TD94ZNUNII-AXS6TD94ZN(4S)-2-(3,6-dioxo-5-phenylpiperazin-2-yl)-5,5-dimethylthiazolidine-4-carboxylic acidAmpicillin trihydrate impurity C [EP]Ampicillin, anhydrous impurity C [EP]49841-96-5AMPICILLIN TRIHYDRATE IMPURITY C [EP IMPURITY]AMPICILLIN, ANHYDROUS IMPURITY C [EP IMPURITY]AMPICILLIN TRIHYDRATE IMPURITY C (EP IMPURITY)