Cc1ccc(N2C(=O)C3N=NN(CC(=O)N4N=C(c5ccccc5)CC4c4ccccc4)C3C2=O)cc1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?