O=C1/C(=C2\C(=O)N(Cc3ccc(F)cc3)c3ccccc32)SC(=S)N1CCS(=O)(=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?