CO/N=C(\C(=O)[N-]n1cn[n+](CC(=O)OC(C)(C)C)c1)c1csc(NC(c2ccccc2)(c2ccccc2)c2ccccc2)n1
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?