O=C(OCC(=O)c1ccc[nH]1)c1ccc(F)c(S(=O)(=O)N2CCOCC2)c1
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?