Cc1ccc(C(=O)N/N=C(\N=N\c2cccc([N+](=O)[O-])c2)c2ccc(N(CCC#N)CCC#N)cc2C)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?