CCC(C)n1ncn(-c2ccc(N3CCN(c4ccc(O)cc4)CC3)cc2)c1=O
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?