N#Cc1cccc(NC(=O)C[n+]2c3n(c4ccc(C(F)(F)F)cc42)CCCCC3)c1.[Cl-]
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?