CCn1c(=O)[nH]c(=O)c2c(N)c(C(=O)c3ccccc3OC)sc21
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?