COc1ccc(C(C)(C)NC(=O)C2CCC(=O)N(CCCN3CCCC3=O)C2)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?