O=C(Nc1nnc(C2CC2)s1)c1cc(S(=O)(=O)N2CCN(c3ccccc3)CC2)ccc1Cl
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?