CN(C(=O)c1ccc(NC(=O)Cc2cccc(NC(=O)C3CCN(C(=O)C4CC4)CC3)c2)cc1)C1CCCC1
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?