CN1CCC23c4c5ccc(O)c4OC2c2[nH]c4ccccc4c2CC3(O)C1C5
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?