2 4 6-tri(4-pyridyl)-1 3 5-triazine July 8, 2019 16 32 64 128 2 4 6-tri(2-pyridyl)-1 3 5-triazine 2 4 6-tri(2-pyridyl)-s-triazine 2 4 6-tris(2-pyridyl)-s-triazine 2 4 6-tris(2-pyridyl)-s-triazine (tptz)