C=CCN1CC[C@]23CCCCC2[C@H]1Cc1ccc(O)cc13.O=C(O)C(O)C(O)C(=O)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?