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In the title compound, C8H7BrO3, an intra­molecular hydrogen bond exists between the hydroxyl group and the O atom of the carbonyl group. The mol­ecules are stacked along the b axis with weak π–π inter­actions.

The molecule of the title compound, C11H12N2O6, is essentially planar except for the alkyl chain, which has a non-extended conformation.

In the title compound, C10H11NO5, all bond lengths and angles show normal values. Weak inter­molecular O—H⋯O hydrogen bonds form centrosymmetric dimers, which are further linked by π–π inter­actions into ladders extending along the a axis.

In the title compound, C7H13NO4, there are two independent mol­ecules in the asymmetric unit. All bond lengths and angles in the mol­ecules are in normal ranges. The ψ1 and ψ2 torsion angles are 159.9 (4) and −23.4 (5)°, respectively, in the first molecule, and the ψ3 and ψ4 torsion angles 157.7 (4) and −26.7 (5)°, respectively, in the second. Each of the independent mol­ecules has a different comformation. The translationally and screw-related mol­ecules are connected by N—H⋯O hydrogen bonds, forming a two-dimensional network parallel to the ac plane.