CC1=C[C@H]2[C@@H]3C(=O)N(c4ccc5c(c4)OCO5)C(=O)[C@@H]3[C@H](C(=O)c3ccccc3)N2c2ccc(Cl)cc21
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?