CCOc1cc(C2CC(=O)Nc3c2c(C)nn3-c2nc(C)cc(C)n2)ccc1O
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?