O=c1n(Cc2cc3c(cc2Cl)OCO3)c(=O)n2n1CC[C@H]1/C(=N\OCc3ccccc3)[C@H]3O[C@@H]3[C@@H](O)[C@@H]12
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?