O=C1Nc2c(c(=O)[nH]c(=O)n2Cc2ccccc2)C1(NS(=O)(=O)c1ccccc1)C(F)(F)F
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?