Cc1ccc(-c2c(C#N)c(S)n(NS(=O)(=O)c3ccc(C)cc3)c(=O)c2C#N)cc1
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?