CCOc1ccc(C(=O)N(Cc2ccc(OC)cc2)Cc2cc3cc(OC)ccc3nc2O)cc1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?