Cc1nn(C(C)C(=O)NCc2ccccc2Cl)c(=O)c2c1sc1ccccc12
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?