C12H15NO4, triclinic, P1̄ (no. 2), a = 7.4325(3) Å, b = 7.5171(3) Å, c = 23.7377(9) Å, α = 87.780(3)°, β = 89.105(3)°, γ = 61.299(4)°, V = 1162.42(9) Å3, Z = 4, Rgt(F) = 0.0566, wRref(F2) = 0.1652, T = 100(2) K.

C11H11Cl2NO3, monoclinic, P21/c (no. 14), a = 17.2336(3) Å, b = 4.9604(1) Å, c = 14.3696(3) Å, β = 100.970(2)°, V = 1205.95(4) Å3, Z = 4, Rgt(F) = 0.0313, wRref(F2) = 0.0848, T = 293(2) K.

C12H14N2O6, triclinic, P1̄ (no. 2), a = 4.8835(4) Å, b = 9.2111(7) Å, c = 14.6655(7) Å, α = 76.135(5)°, β = 82.693(6)°, γ = 87.379(7)°, V = 635.19(8) Å3, Z = 2, Rgt(F) = 0.0449, wRref(F2) = 0.1297, T = 293(1) K.

C12H15NO4, triclinic, P1̄ (no. 2), a = 5.0167(2) Å, b = 7.9264(5) Å, c = 15.2073(7) Å, α = 98.909(4)°, β = 92.060(4)°, γ = 101.800(4)°, V = 583.36(5) Å3, Z = 2, Rgt(F) = 0.0403, wRref(F2) = 0.1179, T = 293(2) K.

The X-ray crystal structure determination of the glutaric acid-amide derivative, 4-ClC6H4N(H)C(=O)(CH2)3C(=O)OH (1), is described. The backbone of the molecule adopts an extended, all-trans configuration but the terminal carboxylic acid and phenyl resides are twisted out of the plane through the bridging atoms, as seen in the torsion angles of O(carboxylic acid)–C(m)–C(m)–C(m) [13.9(5)°] and C(m)–N–C(p)–C(p) [47.1(4)°]; m = methylene and p = phenyl. The most striking feature of the molecular packing is the formation of supramolecular tapes mediated by carboxylic acid-O–H⋯O(carbonyl) and amide-N–H⋯O(amide) hydrogen bonding.