CCCN1C(=O)c2[nH]nc(-c3cc(Cl)c(C)cc3O)c2C1c1ccc(O)c(OC)c1
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?