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 2 4 6-tri(2-pyridyl)-1 3 5-triazine 2 4 6-tri(4-pyridyl)-1 3 5-triazine
