COC(=O)c1c(C)[nH]c(C(=O)OCC(=O)c2c(N)n(CC(C)C)c(=O)n(C)c2=O)c1C
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?