Cc1ccc(O)c(C(c2ccc(C(c3cc(C)ccc3O)c3cc(C)ccc3O)cc2)c2cc(C)ccc2O)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?