3-Carbamoyl-2,2-dimethyl­cyclo­pentane-1,1-dicarb­oxy­lic acid

In the title compound, C₁₀H₁₅NO₅, the five-membered cyclo­pentane ring has an envelope conformation, with four atoms lying in a plane (mean deviation = 0.0213 Å), while the fifth atom deviates from this plane by 0.626 (2) Å. A three-dimensional structure is formed through N—H...O and O—H...O hydrogen bonds between the amide and carb­oxy­lic acid groups and both carb­oxy­lic acid and amide O-atom acceptors.