CCOC(=O)Nc1ccc2c(CN3CCN(S(=O)(=O)c4ccc(C(C)C)cc4)CC3)cc(=O)oc2c1
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?