N-氨基甲酰氨基甲酸甲酯

dimethyl 3,6-diphenyl-3,6-dihydropyridazine-1,2-dicarboxylate

dimethyl 3,6-dihydropyridazine-1,2-dicarboxylate

2,5-二氧杂己二酸二甲酯

dimethyl 2,3-diazabicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate