In the title compound, C(12)H(15)NO(3), the N-H and C=O bonds are anti to each other. The C=O and O-H bonds of the acid group display an anti-periplanar orientation relative to each other. The crystal packing features a three-dimensional network of molecules held together by O-H⋯O and N-H⋯O hydrogen bonds.

In the crystal structure of the title compound, C(11)H(13)NO(5)S, the amide C=O and the carboxyl C=O groups of the acid segment orient themselves away from each other. The dihedral angle between the benzene ring and the amide group is 69.0 (2)°. In the crystal, N-H⋯O and O-H⋯O hydrogen bonds link the mol-ecules into layers parallel to the bc plane.

In the title compound, C(12)H(15)NO(3), the conformations of N-H and C=O bonds in the amide segment are anti to each other and that of the amide H atom is syn to the ortho- and meta-methyl groups in the benzene ring. In the crystal, the mol-ecules are linked into infinite chains through inter-molecular O-H⋯O and N-H⋯O hydrogen bonds.

The asymmetric unit of the title compound, C(10)H(7)Cl(2)NO(3), contains two independent mol-ecules. The mol-ecular conformation of each maleamic unit is stabilized by an intra-molecular O-H⋯O(carbon-yl) hydrogen bond owing to the anti disposition of the participating entities. The mean planes through the benzene ring and the amido group are inclined at angles of 45.7 (1) and 40.8 (1)° in the t...

In the crystal structure of the title compound, C(11)H(13)NO(3), the conformations of the N-H and C=O bonds in the amide segment are anti to each other, and that of the amide H atom is anti to the meta-methyl group in the benzene ring. Furthermore, the conformations of the amide oxygen and the carbonyl O atom of the acid segment are also anti to the adjacent -CH(2) groups. The C=O and O-H bonds...

The title compound, C(12)H(13)NO(3), crystallizes with four independent mol-ecules in the asymmetric unit. The N-H bond and the C=O bond in the amide segment are anti to each other. The C=C double bond is cis configured and an intra-molecular O-H⋯O hydrogen bond is formed in each molecule. The mean planes through the aromatic ring and the amide group -NHCO- are inclined at angles of 17.4 (3), 2...

The asymmetric unit of the title compound, C(12)H(15)NO(3), contains two independent mol-ecules. In both mol-ecules, the conformations of the amide oxygen and the carbonyl O atom of the acid segment are anti to the adjacent CH(2) groups. In the crystal, both molecules form inversion dimers linked by pairs of O-H⋯O hydrogen bonds and N-H⋯O interactions link the dimers into [100] chains.

In the title compound, C(10)H(8)N(2)O(5), the mol-ecule is slightly distorted from planarity. The mol-ecular structure is stabilized by two intra-molecular hydrogen bonds. The first is a short O-H⋯O hydrogen bond (H⋯O distance = 1.57 Å) within the maleamic acid unit and the second is a C-H⋯O hydrogen bond (H⋯O distance = 2.24 Å) which connects the amide group with the benzene ring. The nitro gr...

The title compound, C(10)H(6)Cl(3)NO(3), crystallizes with two independent mol-ecules in the asymmetric unit. The mol-ecular structure is stabilized by a short intra-molecular O-H⋯O hydrogen bond within the maleamic unit. In the crystal, each mol-ecule self-associates via N-H⋯O hydrogen bonds into chains, each running along the b axis. Two short inter-molecular Cl⋯O contacts [3.1267 (15) and 3....

In the title compound, C(10)H(10)ClNO(3), the N-H and C=O bonds in the amide segment are trans to each other. In the crystal structure, the mol-ecules are linked into infinite chains through inter-molecular N-H⋯O and O-H⋯O hydrogen bonds.