COc1ccc(NC(=O)C2C3C=CC4(O3)C2C(=O)N(CCN2CCCCC2)C4C(=O)NC2CCCCC2)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?