7597-72-0
4-ethoxy-3,4-dioxobutanoic acid
+
52648-79-0
3-aminobutan-2-one
→
63900-79-8
3-ethoxycarbonyl-4,5-dimethyl-1H-pyrrole-2-carboxylic acid
108-56-5
草酰乙酸二乙酯
600-28-2
2,3-dimethyl-1H-pyrrole