CCOC(=O)C1CCN(c2c(O)nc3ccc(Cl)cc3c2-c2ccccc2)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?