Cc1cc(C)c(/C(O)=C(/C([S-])=Nc2ccc(SC(F)F)cc2)[n+]2ccccc2)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?