Cc1ccc(C)c(NC(=S)N=Nc2c(O)n(C)c3ccc(S(=O)(=O)N4CCOCC4)cc23)c1
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 pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?