CCOc1ccc(S(=O)(=O)Nc2ccc3c(c2)c2c(n3S(=O)(=O)c3ccc(OCC)cc3)CCCC2=O)cc1
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?