CN(C)C1=NC(=O)/C(=C/c2ccc(-c3ccc(S(N)(=O)=O)cc3)o2)S1
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?