Cc1ccc(S(=O)(=O)NCC(=O)OCC(=O)N2N=C(c3ccc(Cl)cc3)CC2c2ccco2)cc1C
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?