O=C(NCCCN1CCOCC1)c1ccccc1N1C(=O)[C@@H]2Cc3c([nH]c4ccccc34)C(c3ccc(F)cc3)N2C1=O
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?