1-ethoxycarbonyl-4,5-dimethoxycarbonyl-1,2,3-triazole

(9ci)-1H-1,2,3-噻唑-1-羧酸乙酯

dimethyl 7-oxabicyclo[2.2.1]hept-2-ene-2,3-dicarboxylate

dimethyl 1-(2-ethoxy-2-oxoethyl)-1H-1,2,3-triazole-4,5-dicarboxylate

1H-1,2,3-噻唑-1-乙酸乙酯