COc1cc(OC(=O)c2c(O)cc(O)c(O)c2C)cc(C)c1C(=O)Oc1cc(C)c(C(=O)O)c(O)c1
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?