O=C(c1c[nH]c(C(=O)N2CCN(c3ccccc3F)CC2)c1)c1cccc(Cl)c1Cl
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 negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?