CC(=O)OCC1OC(NC(=S)CCSc2nc3ccccc3c(=O)n2-c2ccccc2)C(OC(C)=O)C(OC(C)=O)C1OC(C)=O
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?