Cc1cccc(NS(=O)(=O)c2ccc3c(c2)Cc2cc(S(=O)(=O)Nc4cccc(C)c4C)ccc2-3)c1C
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?