CCc1cc(C(=O)Nc2cc(S(=O)(=O)N(CC)CC)ccc2N2CCN(C)CC2)sc1C
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?