Cc1c(CCC(=O)N[C@@H](CC(C)C)C(=O)O)c(=O)oc2cc3oc4c(c3cc12)CCCC4
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?