1 2 4 5-tetrazine-3 6-dicarboxylic acid July 8, 2019 16 32 64 128 2 4 5 trioxin 3 6-di-2-pyridyl-1 2 4 5-tetrazine 1 3 5-triazine-2 4 6-tricarboxylic acid 1 2 4 5-tetrazine
