O=C1NCCN(Cc2ccoc2)C1CC(=O)N(Cc1ccccc1)CC1CCC1
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?