O=C(COc1ccc2c(c1)oc(=O)c1ccccc12)NC[C@H]1CC[C@H](C(=O)O)CC1
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?