Cc1csc(Sc2ccc(C(=O)OCC(=O)Nc3ccc(OC(F)(F)F)cc3)cc2[N+](=O)[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?