O=C(NCCc1ccccc1)N1CCCC(CNS(=O)(=O)Cc2ccccc2)C1
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?