CCCOc1ccc(C(=O)C2=C(O)C(=O)N(c3ccccn3)C2c2ccc(OC)cc2)cc1C
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?