3,3,5-trimethyl-3,5-dihydro-4H-pyrazolo[3,4-d]pyridazin-4-one 4H-pyrazolo[3,4-d]pyridazin-4-one, 3,5-dihydro-3,3,5-trimethyl- InChI=1/C8H10N4O/c1-8(2)6-5(10-11-8)4-9-12(3)7(6)13/h4H,1-3H