O=C(c1cccc(C(F)(F)F)c1)C1CCCN(C(=O)c2cc(C3CC3)[nH]n2)C1
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?