N#C[C-](C#N)c1nc2ccccc2nc1-[n+]1cccc(NC(=O)c2ccccc2)c1
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?