CC(=O)c1c(C)[nH]c(C(=O)CSc2nnc(-c3ccc(Cl)cc3)n2CC2CCCO2)c1C
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?