C[C@]12CC[C@@H]3c4ccc(OP(=O)([O-])O)cc4CC[C@H]3[C@@H]1CCC2=O.[Na+]
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?