O=C1NN(c2ccccc2)C(=O)C2C3c4ccccc4C(c4ccccc43)C12
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?