CCC(C)C(NC(=O)OC(C)(C)C)C(=O)Oc1ccc2c(=O)c(-c3ccc([N+](=O)[O-])cc3)coc2c1
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?