25505-99-1 4,6-Difenilisossazolo(3,4-d)piridazin-7-one [Italian] 4,6-Diphenylisoxazolo(3,4-d)pyridazin-7(6H)-one BRN 1139896 ISOXAZOLO(3,4-d)PYRIDAZIN-7(6H)-ONE, 4,6-DIPHENYL-