O=C(NCc1ccccn1)[C@]1(C(F)(F)F)C[C@H](CCc2ccccc2)CCCO1
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?