Free energy barrier for dissociation of the guanosine monophosphate anion in water Lucas M. Cornetta, Kaline Coutinho, Sylvio Canuto and Márcio T. do N. Varella Eur. Phys. J. D, 70 9 (2016) 176 Published online: 01 September 2016 DOI: 10.1140/epjd/e2016-70155-0