O=C(CN(CC1CCCO1)S(=O)(=O)c1ccc(S(=O)(=O)NC2CC2)cc1)Nc1ccccc1
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?