COc1ccc(CN(C)C(=O)c2ccc(NC(=O)CC3SC(N4CCCC4)=NC3=O)cc2)c(OC)c1OC
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?