CCOC(=O)c1[nH]c(C)c(C(=O)C2=C(O)C(=O)N(CCN3CCOCC3)C2c2cccs2)c1C
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?