Cc1sc2ncnc(N3CCC(C(=O)Nc4cc(Cl)ccc4Cl)CC3)c2c1C
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?