CCOC(=O)c1[nH]c2cc3c(cc2c1NC(=O)CN1CC(C)CC(C)C1)OCO3
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?