CC1=C(C(=O)OCc2ccc3c(c2)OCO3)C(c2cccc([N+](=O)[O-])c2)NC(=O)N1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?