CCn1nc(C(=O)OC(C(=O)c2c[nH]c3ccccc23)c2ccccc2)c2ccccc2c1=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?