Cc1cc(C)c(NC(=O)CN2C(=O)CCSc3ccc(S(=O)(=O)N4CCCC4)cc32)c(C)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?