(2R)-(2R)-2-Phenylglycyl-2-[(2R,4S)-4-carboxy-5,5-dimethyl-2-thiazolidinyl]glycine; α-(2-Amino-2-phenylacetamido)-4-carboxy-5,5-dimethyl-2-thiazolidineacetic Acid; [2R-[2α[R*(R*)],4β]]-α-[(Aminophenylacetyl)amino]-4-carboxy-5,5-dimethyl-2-thiazolidineacetic Acid