CCOc1ccc(NC(=O)CN(C)c2ccc(S(=O)(=O)N(C(C)C)C(C)C)cn2)cc1OCC
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?