CCCCC1(N=[N+]=[N-])C(=O)C2C=CC=C3c4ccccc4N(C1=O)C32
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?