Cc1cccc(NS(=O)(=O)c2cccc(C(=O)NCC(c3ccco3)N3CCCCC3)c2)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 pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?