CNC[C@H]1Oc2ccc(NC(=O)Nc3ccccc3)cc2CC(=O)N([C@H](C)CO)C[C@H]1C
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?