Cc1ccc(N2NC(=O)/C(=C/c3c(C)c(C#N)c4nc5ccccc5n4c3O)C2=O)cc1C
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?