(1,2,4)Triazino(3,4-f)purine-6,8(7H,9H)-dione, 1,4-dihydro-3,9-dimethyl-1-ethyl- 1,4-Dihydro-3,9-dimethyl-1-ethyl-(1,2,4)triazino(3,4-f)purine-6,8(7H,9H)-dione 106087-29-0