CCOc1ccccc1CNc1nc2[nH]c(C)c(CC(=O)OC)c(=O)n2n1
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?