818-38-2
戊二酸二乙酯
+
60-34-4
甲基肼
→
~92%
88563-12-6
ethyl 2-(2-methyl-3-oxo-1H-pyrazol-5-yl)acetate
88550-18-9
2-(1,4-dimethyl-6-oxopyrano[2,3-c]pyrazol-3-yl)acetic acid