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