8-Carbamoyl-3-ethylimidazo(5,1-d)-1,2,3,5-tetrazin-4(3H)-one 97716-74-0 Ccrg 82019 Ethazolastone Imidazo(5,1-d)-1,2,3,5-tetrazine-8-carboxamide, 3-ethyl-3,4-dihydro-4-oxo-