Cc1cccc(-n2c(=O)c3c(c4cc(C)ccc4n3C)n(CC(=O)Nc3ccc(C)cc3C)c2=O)c1
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?