O=C(Nc1cccc(-n2cccn2)c1)C1CCCN(Cc2cccc(F)c2F)C1
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?