CCCn1c2ccccc2c2cnn(CC(=O)Nc3cc(C)c(Cl)cc3OC)c(=O)c21
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?