Cc1ccc2c(=O)cc(C(=O)Nc3ccc(S(=O)(=O)N4CCCC(C)C4)cc3)oc2c1C
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?