C[C@@H](CO)N1C[C@@H](C)[C@H](CN(C)C(=O)Nc2cccc3ccccc23)Oc2c(NC(=O)Nc3ccccc3)cccc2C1=O
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?