
Molecules of 4-hydroxyisophthalic acid, C8H6O5, are disordered over two equally occupied orientations across a mirror plane. Each molecule contains an O-H
O intramolecular hydrogen bond, and both carboxylic acid groups are involved in R22(8) intermolecular hydrogen bonding. The crystal structure is further supported by
-
-stacking interactions.

![[pi]](/logos/entities/pi_rmgif.gif)
![[pi]](/logos/entities/pi_rmgif.gif)
Supporting information
![]() | Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536803014740/cf6269sup1.cif |
![]() | Structure factor file (CIF format) https://doi.org/10.1107/S1600536803014740/cf62691sup2.hkl |
CCDC reference: 221675