CCn1nc(C(=O)NNS(=O)(=O)c2cc(/C=C/C(=O)O)cc(OC)c2OC)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?