2,6,6-Trimethyl-cyclo-hex-2-ene-carb-oxy-lic acid.

In the title crystal structure, C(10)H(16)O(2), inversion-related mol-ecules are linked by pairs of O-H⋯O hydrogen bonds involving carboxyl groups to form R(2) (2)(8) dimers. The cyclo-hexene ring displays a half-chair conformation.

2,6,6-Trimethyl-cyclo-hexene-1-carbaldehyde oxime.

In the crystal of the title compound C(10)H(17)NO, synthesized by the reaction of ß-cyclo-citral with hydroxyl-amine hydro-chloride, inversion-related mol-ecules are linked by a pair of O-H⋯N hydrogen-bonding inter-actions between the oxime functionalities, forming R(2) (2)(6) loops. The molecular conformation is stabilized by intra-molecular methyl C-H⋯N inter-actions. The cyclohexene ring has the typical half-chair conformation.