Ampicillin EP Impurity D

Chemical Name: (4S)-2-[[[(2R)-2-amino-2-phenylacetyl]amino]carboxymethyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxylic acid (as per EP); (4S)-2-{[(R)-2-Amino-2-phenylacetamido]methyl}-5,5-dimethylthiazolidine-4-carboxylic acid (as per USP)