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Pyroglutamic acid149-87-1100 % similar (+)-Pyroglutamic acid4042-36-8100 % similar L-Pyroglutamic acid98-79-3100 % similar 6-Oxopiperidine-2-carboxylic acid3770-22-778 % similar Glycyl-L-glutamic acid7412-78-462 % similar Zinc PCA15454-75-861 % similar Glycyl-L-glutamine13115-71-458 % similar Methyl pyroglutamate4931-66-255 % similar Methyl 5-oxopyrrolidine-2-carboxylate54571-66-355 % similar Alpha-guanidinoglutaric acid73477-53-953 % similar Pidotimod121808-62-653 % similar L-Arginine L-pyroglutamate56265-06-652 % similar Fasoracetam110958-19-551 % similar N-Acetyl-L-glutamic acid1188-37-051 % similar N-Acetylglutamic acid5817-08-351 % similar L-Pyroglutamic acid ethyl ester7149-65-751 % similar Phenylacetylglutamine28047-15-650 % similar 5-Oxo-L-proline 1,1-dimethylethyl ester35418-16-750 % similar Glycylserine687-38-750 % similar Aceglutamide2490-97-349 % similar