CCOCC(=O)N[C@H]1CCc2cc(OC(=O)COCC)c(OC)c(OC)c2-c2ccc(SC)c(=O)cc21
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?