N#Cc1ccc(NC(=O)C[n+]2c3n(c4ccc(C(F)(F)F)cc42)CCCCC3)cc1.[Br-]
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?