4-OXO-PROLINE BOC-4-OXO-L-PROLINE TERT-BUTYL ESTER N-Boc-4-oxo-L-proline L-KYNURENINE N-Boc-4-oxo-L-Proline methyl ester 2-amino-4-(2-amino-3-hydroxy-phenyl)-4-oxo-butanoic acid Propanedioic acid, ((2-amino-3-hydroxy-1-oxopropyl)amino)(2-(5-(aminom ethyl)-2,5-dihydro-4-hydroxy-2-oxo-1H-pyrrol-3-yl)-2-oxoethyl)- FMOC-L-HOMOPRO(4-OXO) N-CARBOBENZOXY-4-OXO-L-PROLINE (S)-2-AMINO-4-OXO-4-PHENYLBUTANOIC ACID Norvaline, 4-oxo- (9CI) B-ANTHRAANILOYL-L-ALANINE SULFATE L-KYNURENINE SULFATE (S)-4-OXO-PIPERIDINE-2-CARBOXYLIC ACID FMOC-L-PRO(4-OXO) (S)-2-TERT-BUTOXYCARBONYLAMINO-4-OXO-4-(1H-PYRAZOL-3-YL)-BUTYRIC ACID FMOC-KYNURENINE (S)-2-TERT-BUTOXYCARBONYLAMINO-4-OXO-PENTANOIC ACID