COc1ccc2c(c1)c(=O)oc1c(C)c(OCc3ccc(C(=O)O)cc3)ccc12
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?