CCCC1=NN(c2ccccc2)C(=O)/C1=C/c1ccc(OCc2ccc(C(=O)O)cc2)cc1
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?