Cc1cccc(NC(=O)CSc2nc(-c3ccccc3Cl)nc3c2Cc2c(CO)cnc(C)c2O3)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?