25506-06-3 4-Fenilisossazalo(3,4-d)piridazin-7-one [Italian] 4-Phenylisoxazolo(3,4-d)pyridazin-7(6H)-one BRN 1117622 ISOXAZOLO(3,4-d)PYRIDAZIN-7(6H)-ONE, 4-PHENYL-