Cc1cc(OCC(=O)N[C@@H](Cc2ccccc2)c2nc3ccccc3[nH]2)ccc1Cl
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?