5-methyl-4-(naphthalen-2-yldiazenyl)-2-(pyridine-4-carbonyl)-4h-pyrazol-3-one
CAS No. 78503-85-2
2-isonicotinoyl-5-methyl-4-(2-naphthyldiazenyl)-2,4-dihydro-3H-pyrazol-3-one