CCc1cc2c(=O)c(-c3nc4ccccc4n3C)c(C)oc2c(CN(CC)CC)c1O
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?