4H,7H-tetrazolo[1,5,4-ij][1,8]naphthyridine, 5,6,8,9-tetrahydro- 5,6,8,9-tetrahydro-4H,7H-tetrazolo[1,5,4-ij]-1,8-naphthyridine InChI=1/C8H12N4/c1-3-7-4-2-6-12-8(7)11(5-1)9-10-12/h1-6H