Xanthylium, 9-(2-carboxyphenyl)-3,6-bis(diethylamino)-, 4-(2-(5-chloro-2-hydroxyphenyl)diazenyl)-4,5-dihydro-3-methyl-1-phenyl-3H-pyrazol-3-one 4,5-dihydro-4-(2-(2-hydroxy-5-nitrophenyl)diazenyl)-3-methyl-1-phenyl-3H-pyrazol-3-one 3-(2-(1-(((2-ethylhexyl)