CCc1ccc2c(c1)cc(CN(C(S)=Nc1ccccc1Cl)C1CC1)c1nnnn12
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?