N-(4-Isocyano­phen­yl)succinamic acid

In the crystal structure of the title compound, C₁₁H₁₀N₂O₃, inversion-related mol­ecules are connected by pairs of O—H...O hydrogen bonds. With the exception of the atoms in the carb­oxy­lic acid group, the non-H atoms are roughly coplanar with a maximum deviation from the mean plane of 0.270 (1) Å for the C atom to which the carb­oxy­lic group is attached. The C atom of the carb­oxy­lic group lies 1.730 (2) Å from the mean plane.