Cc1nn(C)c(C(=O)NN=C(S)Nc2ccc(F)cc2)c1[N+](=O)[O-]
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?