1H-pyrazolo[3,4-d]pyrimidine-4,6(5H,7H)-dione, 5-ethyl-7-methyl- 5-ethyl-7-methyl-1H-pyrazolo[3,4-d]pyrimidine-4,6(5H,7H)-dione InChI=1/C8H10N4O2/c1-3-12-7(13)5-4-9-10-6(5)11(2)8(12)14/h4H,3H2,1-2H3,(H,9,10