C/C(=N\NC(N)=O)C(CN1CCOCC1)C(c1ccccc1)c1c(O)c2ccccc2oc1=O.Cl
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?