1 2 4 triazole nmr July 8, 2019 16 32 64 128 1 2 4 triazole 1h nmr 3-amino-1 2 4-triazole nmr 1-benzyl-4-phenyl-1 2 3-triazole nmr 1 2 4-triazoles 1 2 4 triazole 1 2 4-triazole-3-thiol 1 2 4-triazole ligand