Cc1ccc2oc3c(c(=O)c2c1)C(c1cccc(O)c1)N(Cc1ccccc1Cl)C3=O
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?