2H-triazole 2H-1,2,3-triazole 37306-44-8 288-35-7 288-36-8 CHEBI:35566 CHEBI:35565 333662_ALDRICH Triazole ZINC04807252 V-triazole InChI=1/C2H3N3/c1-2-4-5-3-1/h1-2H,(H,3,4,5 Osotriazole 1H-1,2,3-Triazole