O=C(C1=C(O)C(=O)N(Cc2ccccc2)C1c1ccncc1)c1ccco1
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?