The three-dimensional structure of the title compound, C15H14O4, has b
een determined. The molecule assumes a skew conformation, the angle be
tween the two phenyl rings being 84.8(1)degrees. The carboxylic acid s
ubstituent is essentially coplanar with the ring. The molecules are co
nnected by O...O intermolecular hydrogen bonds ranging from 2.6 to 2.9
Angstrom. Distorted bond angles at the substituted phenyl C atoms wer
e observed and they agree with the values reported in the literature f
or other bridged diphenyls.