Nc1nc(SCC(=O)c2ccc(Cl)cc2)c2ncn(C3OC(CO)C(O)C3O)c2n1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?