COc1ccc(NC(=S)N/N=C(\C)c2cccc(/C(C)=N/NC(=S)Nc3ccc(OC)cc3)n2)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 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?