The cyclohexanone ring in the title compound, C16H24O5, adopts a chair
conformation with the methyl and acrylic acid groups in axial and equ
atorial positions, respectively. The dihedral angle between the planes
of the two rings is 73 (1)degrees. The bond angles around the spiro C
atom are all nearly tetrahedral [104.8(2)-113.0 (2)degrees].