872-85-5
4-吡啶甲醛
+
141-97-9
乙酰乙酸乙酯
109-77-3
丙二腈
→
~89%
106753-78-0
6-Amino-3-methyl-4-(4-pyridinyl)-2,4-dihydropyrano[2,3-c]pyrazole -5-carbonitrile