2-Hydroxy-3-methoxybenzoic acid monohydrate

The asymmetric unit of the title compound, C8H8O4 H2O, contains two organic molecules which are connected by the two water molecules through O—H O hydrogen bonds, forming an R4 (12) ring. Further O—H O hydrogen bonds assemble these rings through R6 (18) rings, giving rise to infinite helical chains arranged around the b axis. These helical chains are assembled by offset – stacking interactions [centroid–centroid distance = 3.6432 (8) A] between the aromatic rings of neigboring chains, forming a supramolecular network.