COc1ccc(NC(=O)c2cccc(NC(=O)C3C4CC5OC(=O)C3C5C4)c2)c(OC)c1
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?