ethyl 1-acetyl-4-oxocyclohexane-1-carboxylate

4-乙酰基-4-乙氧基羰基庚二酸

methyl 4-methoxy-2-oxobicyclo[2.2.2]octane-1-carboxylate

6-methoxy-4,5,6,7-tetrahydro-3a,6-ethanoindazol-3(2H)-one

4-羟基双环[2.2.2]辛烷-1-羧酸