1 XY1 4-[(E)-[5-(2-azanylethyl)-2-oxidanyl-phenyl]diazenyl]benzoic acid 1.000 2 A1APX 4-[(E)-phenyldiazenyl]benzoic acid 0.810 3 YPZ 3-[(3z)-4-hydroxy-6-oxo-3-(2-phenylhydrazinylidene)cyclohexa-1,4-dien-1-yl]-L-alanine 0.720 4 A1ADF 4-{(E)-[4-(dimethylamino)phenyl]diazenyl}benzoic acid 0.708