CN[C@@H](C)C(=O)N[C@H]1CCCCN(Cc2nc(-c3ccccc3)c(-c3ccccc3)o2)C1=O.O=CO
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?