CCN(c1ccccc1)S(=O)(=O)c1cccc(C(=O)OCc2nc(O)c3c(C)c(C)sc3n2)c1
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?