Cc1ccc2nc(-c3ccc(O)cc3)c(Nc3ccc4c(c3)OCCO4)n2c1
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?