CCOC(=O)Nc1ccc2c(c1)N(C(=O)CN(CC)CC)c1ccccc1C=C2.Cl.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?