C=CCN1C(=O)NC(c2ccccc2)(C(F)(F)F)S/C1=C(/C#N)c1nnc(N2CCOCC2)n1-c1ccccc1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?