CC1(c2ccccc2)NC(=O)N(CC(=O)N2CCN(S(=O)(=O)c3ccccc3[N+](=O)[O-])CC2)C1=O
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?