O=C(O)CN(CC(=O)O)Cc1cc2c(-c3ccccc3C(=O)O)c3cc(CN(CC(=O)O)CC(=O)O)c(=O)cc-3oc2cc1O
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?