O=C(CN1CCC(C(=O)c2ccc3c(c2)OCCO3)CC1)Nc1ccccc1C(F)(F)F
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?