2H-Tetrazole 2H-1,2,3,4-tetrazole 27988-97-2 100043-29-6 288-94-8 1-H-Tetrazole 1H-Tetrazole NSC36712 Tetraazacyclopentadiene CHEBI:33193 88185_FLUKA InChI=1/CH2N4/c1-2-4-5-3-1/h1H,(H,2,3,4,5 ZERO/000047 CHEBI:33194 AIDS-020352 AIDS020352 EINECS 206-023-4 NSC 36712 AI3-61734 Tetrazole 554049_SIAL Tetrazole solution