CN(C(=O)c1ccc(NC(=O)Cc2ccc(NC(=O)C3CCCN(C(=O)C4CC4)C3)cc2)cc1)C1CCCC1
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?