O=C(CN1CCN(S(=O)(=O)c2ccccc2)CC1)Nc1ccc2c(c1)CCC2
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?