Dimethyl 1 2 4 5 tetrazine 3 6 dicarboxylate July 8, 2019 16 32 64 128 1 3-dimethyl-3 4 5 6-tetrahydro-2(1h)-pyrimidinone Diethyl 2 6-dimethyl-1 4-dihydropyridine-3 5-dicarboxylate 2 6-dimethyl-3 5-dicarbethoxy-1 4-dihydropyridine 4 4 5 5-tetramethyl-1 3 2-dioxaborolane