O=C(Nc1ccccc1)N1CCC(c2nc(-c3ccc(S(=O)(=O)N4CCOCC4)cc3)no2)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?