Sc1nnc(CNc2ccc(-c3nnc(S)n3-c3ccc(Cl)cc3)cc2)n1-c1ccc(Cl)cc1
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?