21170-91-2
→
21173-67-1
bicyclo[3.2.2]nonane-7,9-dione
787-07-5
1,4-环己二酮-2,5-二甲酸二乙酯
64810-37-3
7,9-dioxobicyclo[3.2.2]nonane-1,5-dicarboxylic acid