NC(=O)c1ccc(NC(=O)CNc2cc(S(=O)(=O)N3CCOCC3)ccc2N2CCCC2)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?