COc1cc(OC)c(OC)cc1/C=c1\[nH]c(=O)/c(=C/c2cc(OC)c(OC)cc2OC)[nH]c1=O
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?