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5-Ethenyl-2-pyrrolidinone7529-16-0100 % similar (5S)-5-(Hydroxymethyl)-2-pyrrolidinone17342-08-442 % similar Pyroglutamic acid149-87-139 % similar (+)-Pyroglutamic acid4042-36-839 % similar L-Pyroglutamic acid98-79-339 % similar Methyl pyroglutamate4931-66-234 % similar Methyl 5-oxopyrrolidine-2-carboxylate54571-66-334 % similar 6-Oxopiperidine-2-carboxylic acid3770-22-733 % similar Fasoracetam110958-19-533 % similar L-Pyroglutamic acid ethyl ester7149-65-733 % similar Vigabatrin60643-86-932 % similar 5-Oxo-L-proline 1,1-dimethylethyl ester35418-16-732 % similar