COc1cccc(NC(=O)Cn2c(=O)n(-c3cc(OC)c(OC)c(OC)c3)c(=O)c3ccccc32)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?