Oc1ccc2c3c1O[C@H]1c4c(c5ccccc5n4Cc4ccccc4)C[C@]4(O)[C@H](C2)N(CC2CC2)CC[C@@]314
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?