COc1ccccc1-n1c(C)c(C(=O)O)c2cc(OC)c3ccccc3c21
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?