CCOC(=O)c1c(C)sc(-c2c(-c3cc(C)ccc3C)[nH]c3c2c(=O)[nH]c(=O)n3C)c1O
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?