Cooperative intramolecularly hydrogen-bonded motif in the structure of 2:2 complex of TBD with 4-nitrocatechol - S. W. Ng, P. Naumov, S. Chantrapromma, S. S. S. Raj, H.-K.Fun, A. R. Ibrahim, G. Wojciechowski, B. Brzezinski (My University, 2001)