1-O-tert-butyl 2-O-methyl (2S)-5-oxopyrrolidine-1,2-dicarboxylate, Methyl Boc-L-Pyroglutamate, Boc-pGlu-OMe, Methyl (S)-N-(tert-butoxycarbonyl)pyroglutamate, Methyl (2S)-1-(tert-butoxycarbonyl)py, Methyl (S)-Boc-5-pyrrolidone-2-carboxylate, Boc-L-Pyroglutamic acid methyl ester, Boc-Pyr-Ome, (S)-1-tert-Butyl 2-methyl 5-oxopyrrolidine-1,2-dicarboxylate