Cl.[O-][n+]1c2cc(CN3CCOCC3)c(CN3CCOCC3)cc2[n+]([O-])c2c(O)cccc21
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?