N-(tert-butyloxycarbonyl)-4-oxoproline benzyl ester

benzyl (2S,4R)-N-tert-butoxycarbonyl-4-oxoprolinate

benzyl Nα-Boc-4-keto-L-prolinate

benzyl (2S)-N-tert-butoxycarbonyl-4-oxoprolinate

benzyl (S)-1-tert-butoxycarbonyl-4-oxopyrrolidine-2-carboxylate

(S)-2-benzyl 1-tert-butyl 4-oxopyrrolidine-1,2-dicarboxylate

2-benzyl 1-tert-butyl (2S)-4-oxo-1,2-pyrrolidinecarboxylate