CCOc1ccccc1N(C)S(=O)(=O)c1ccc2ncc(C(=O)N(CCOC)CCOC)c(O)c2c1
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?