COc1cc(C(=O)OCC(=O)Nc2ccc3c(c2)OC(F)(F)O3)ccc1OCc1c(C)noc1C
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?