Cc1cc2nc(CN(C)Cc3c(C(=O)N(C)C)nc4ccc(Cl)cn34)[nH]c2cc1C
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?