COc1cccc(-c2cnc3c(NC=O)cc(-c4cc(OC)c(OC)c(OC)c4)cn23)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?