3-(2-Chloroethyl)-3,4-dihydro-4-oxopyrazolo(5,1-d)-1,2,3,5-tetrazine-8-carboxamide 90521-23-6 Cedopt Pyrazolo(5,1-d)-1,2,3,5-tetrazine-8-carboxamide, 3-(2-chloroethyl)-3,4-dihydro-4-oxo-