1 2 4-triazine July 8, 2019 16 32 64 128 1 2 4 triazine synthesis 1 2 4 triazine structure 1 3 5-triazine-2 4 6-triamine 3 amino 1 2 4 triazine Benzo e 1 2 4 triazine 1 3 5-triazine-2 4 6-triamine melamine 1 2 3-triazine 1 2 4-triazine-3 5(2h 4h)-dione 1 2 4-triazinone wikipedia