Date Published: July 01, 2012
Publisher: International Union of Crystallography
Author(s): Katarzyna A. Solanko, Andrew D. Bond.
The title compound, C16H12O6, is a common impurity of ortho-acetylsalicylic acid (aspirin). The benzene rings form a dihedral angle of 81.9 (1)° while the acetyl and carboxyl groups form dihedral angles of 74.0 (1) and 26.4 (2)°, respectively, with the benzene rings to which they are bound. In the crystal, molecules are linked by pairs of O—H⋯O hydrogen bonds between the carboxyl groups, forming inversion dimers.
For background literature concerning the crystallization and crystal structure of aspirin, see: Bond et al. (2007 ▶, 2011 ▶). For a discussion of the pharmacological effects of acetylsalicylsalicylic acid, see: Bundgaard (1974 ▶). For related structures, see: Greener et al. (2000 ▶); Cox et al. (2000 ▶); Iqbal et al. (2007 ▶).