Cc1nn(-c2ccccc2)c(C)c1/C=N/NC(=O)c1sc(=S)n(-c2ccc(Cl)cc2)c1N
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?