O=C1CC(N2C(=O)/C(=C/C=C/c3ccccc3)SC2=S)C(=O)N1c1ccccc1
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 negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?