4H-pyrazolo[3,4-d]pyrimidin-4-one, 5-ethyl-1,5-dihydro-1,6-dimethyl- 5-ethyl-1,6-dimethyl-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one InChI=1/C6H6BrN5O/c1-13-5-2-3(7)11-12-4(2)9-6(8)10-5/h1H3,(H3,8,9,10,11,12