COc1cc(OC)cc(N(C(=O)C2COc3ccccc3O2)C(C(=O)NC2CCCCC2)c2ccc(O)cc2)c1
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?