亚胺二乙酸二乙酯

对甲苯磺酰胺

1-O-ethyl 2-O,5-O-dimethyl azepine-1,2,5-tricarboxylate

ethyl N-(2,5-dimethoxycarbonyl phenyl)carbamate

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