O=C(NCc1ccccn1)C(=O)NCC1OCCCN1S(=O)(=O)c1cc(F)ccc1F
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?