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Fasoracetam110958-19-5100 % similar Pyroglutamic acid149-87-151 % similar (+)-Pyroglutamic acid4042-36-851 % similar L-Pyroglutamic acid98-79-351 % similar Methyl pyroglutamate4931-66-249 % similar Methyl 5-oxopyrrolidine-2-carboxylate54571-66-349 % similar Pidotimod121808-62-648 % similar L-Pyroglutamic acid ethyl ester7149-65-746 % similar 5-Oxo-L-proline 1,1-dimethylethyl ester35418-16-745 % similar 6-Oxopiperidine-2-carboxylic acid3770-22-745 % similar Proglumide6620-60-640 % similar Piperidin-4-yl(pyrrolidin-1-yl)methanone35090-95-038 % similar (Hexahydro-1H-azepin-1-yl)-3-piperidinylmethanone690632-28-138 % similar Zinc PCA15454-75-836 % similar TSH-releasing hormone24305-27-935 % similar (S)-3-Amino-1-ethylazepan-2-one206434-45-935 % similar Glycyl-L-glutamic acid7412-78-435 % similar Pramiracetam68497-62-135 % similar L-Arginine L-pyroglutamate56265-06-635 % similar (5S)-5-(Hydroxymethyl)-2-pyrrolidinone17342-08-434 % similar