CC(=O)Nc1ccc(/C=N/Nc2ccc(C(=O)c3c(C)cc4ccccn34)cc2[N+](=O)[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?