Cc1ccc(C)c(Oc2coc3cc(OCC(=O)Nc4ccccc4C(C)C)ccc3c2=O)c1
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?