COc1ccc(-c2noc(-c3ccc(NCCc4ccccc4)c([N+](=O)[O-])c3)n2)cc1OC
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?