CCOC1SC(SC)=NN1C(=O)C(OC(C)=O)C(OC(C)=O)C(OC(C)=O)C(OC(C)=O)C(=O)N1N=C(SC)SC1OCC
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?