O=C(Nc1ccc2c(c1)OCO2)C(c1ccccc1)N1CCC2(CC1)OCCO2
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?