COc1ccc(C(=O)[C@H]2[C@H]3C(=O)N(c4ccc(OC(C)=O)cc4)C(=O)[C@H]3C3C=CC=NN32)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?