COc1ccc(C2(C(=O)Nc3ccc(S(=O)(=O)Nc4nc(C)cc(C)n4)cc3)CCCC2)cc1OC
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?