CCOC(=O)c1c(NC(C)=O)c2c3c(sc2n1Cc1cccc(Cl)c1)CCCC3
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?