Cc1ccc([N+](=O)[O-])cc1S(=O)(=O)Nc1ccc(-c2ccc(N3CCOCC3)nn2)cc1
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?