COc1ccc(-c2cc(C(F)F)n3ncc(C(=O)Nc4c(C)n(C)n(-c5ccccc5)c4=O)c3n2)cc1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?