COc1ccccc1N1CC(C(=O)Nc2ccc(C)c(S(=O)(=O)N3CCOCC3)c2)CC1=O
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?