CCCCOc1ccc(NC(=O)c2cc3c(n(-c4ccc(Cl)cc4)c2=O)CCCC3=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?