C=C[C@@H]1CN2CC[C@H]1C[C@H]2[C@@H](O)c1ccnc2ccccc12
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?