1 YPZ 3-[(3z)-4-hydroxy-6-oxo-3-(2-phenylhydrazinylidene)cyclohexa-1,4-dien-1-yl]-L-alanine 1.000 2 PAQ 2-oxy-4-hydroxy-5-(2-hydrazinopyridine)phenylalanine 0.913 3 TRW Trw3-(2-amino-3-hydroxy-propyl)-6-(N'-cyclohexyl-hydrazino)octahydro-indol-7-ol 0.731 4 XY1 4-[(E)-[5-(2-azanylethyl)-2-oxidanyl-phenyl]diazenyl]benzoic acid 0.720