O=C1NC(=S)N(Cc2ccc(F)cc2)C(=O)/C1=C/NCc1ccc2c(c1)OCO2
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?