C[C@H]1CN([C@H](C)CO)C(=O)c2cccc(NC(=O)NC3CCCCC3)c2O[C@@H]1CN(C)C(=O)Nc1ccccc1
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?