4-methyltetrazolo[5,1-c][1,2,4]triazin-7(4H)-one InChI=1/C4H4N6O/c1-9-4-6-7-8-10(4)3(11)2-5-9/h2H,1H tetrazolo[5,1-c][1,2,4]triazin-7(4H)-one, 4-methyl-