Cc1cccc2c1C(=O)[C@](C)([C@]1(C)Nc3cccc(C)c3C1=O)N2
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?