(2S)-2-amino-4-(2-formamidophenyl)-4-oxobutanoic acid (2S)-2-amino-4-(2-formamidophenyl)-4-oxo-butanoic acid (2S)-2-amino-4-(2-formamidophenyl)-4-keto-butyric acid C02700 L-Formylkynurenine CHEBI:30249 N'-formylkynurenine 3-(2-formamidobenzoyl)-L-alanine