3 6-di-2-pyridyl-1 2 4 5-tetrazine July 8, 2019 16 32 64 128 3 6-di(pyridin-4-yl)-1 2 4 5-tetrazine 3 6-di(pyridin-2-yl)-1 2 4 5-tetrazine 3-(2-pyridyl)-5 6-diphenyl-1 2 4-triazine 2 4 6-tri(4-pyridyl)-1 3 5-triazine
