CCN1CCN(c2ccc(Nc3ncc(Cl)c(Nc4ccc(O)c(NC(C)=O)c4)n3)cc2)CC1
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?