O=C1C2N=NN(CC(=O)N3N=C(c4cccc5ccccc45)CC3c3ccccc3)C2C(=O)N1c1ccccc1
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 negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?