CCn1c2ccccc2c2cc(NC(=O)c3cccc([N+](=O)[O-])c3C)ccc21
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?