CC(C)n1c(N2CCN(C(=O)Nc3ccc(Cl)cc3)CC2)nc2ccccc21
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?