CCOC(=O)N1CCC(NC(=O)c2ccc3c(c2)N(Cc2ccc(Cl)cc2)C(=O)c2ccccc2S3(=O)=O)CC1
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?