(S)-2-Amino-4-methyl-N-(4-nitrophenyl)valeramide 110893-28-2 4178-93-2 86237-92-5 EINECS 224-047-3 L-LEUCINE-4-NITROANILIDE L-Leucine-p-nitroanilide Pentanamide, 2-amino-4-methyl-N-(4-nitrophenyl)-, (2S)-