COc1ccc(Cl)cc1NC(=O)CSC1=Nc2ccccc2C2=NC(CC(=O)NCc3ccc4c(c3)OCO4)C(=O)N12
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?