CCCNC(=O)c1ccccc1N1CCN(CCCCN2C(=O)C3CCCCN3C2=O)CC1.Cl.O
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?