COc1cc(/C=C2\S/C(=N\c3ccccc3)N(CCc3c[nH]c4ccccc34)C2=O)ccc1OC(C)C(=O)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 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?