The title compound, C14H11ClN2O3, contains an azo group (-N=N-), and the configuration around the -N=N- double bond is trans. There are intramolecular O-H (...) O and intermolecular C-H (...) O hydrogen bonds, and the ...

The molecule of the title compound, C15H14N2O4, is approximately planar and displays a trans configuration with respect to the N=N double bond. The molecules are linked by intermolecular C-H (...) O and C-H (...)pi ...