1 F18 4-[(E)-(3,5-diamino-1h-pyrazol-4-yl)diazenyl]phenol 1.000 2 U13 4-(4-fluoro-phenylazo)-5-imino-5h-pyrazol-3-ylamine 0.882 3 U14 3-(5-amino-3-imino-3h-pyrazol-4-ylazo)-benzoic acid 0.789 4 U12 5-imino-4-(3-trifluoromethyl-phenylazo)-5h-pyrazol-3-ylamine 0.750 5 U19 5-imino-4-(2-trifluoromethyl-phenylazo)-5h-pyrazol-3-ylamine 0.750