CCN1CCN(C(c2ccc(SC)cc2)c2c(O)cc(C)n(Cc3ccco3)c2=O)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 pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?