CCOc1ccccc1N(C)C(=O)Cn1cnc2sc(C)c(S(=O)(=O)N3CCC(C)CC3)c2c1=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?