CC1=C(C(=O)OC2CCCC2)C(c2coc3ccccc3c2=O)C2=C(O)CC(C)(C)CC2=N1
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?