CCCCc1c(OC)cc(O)c2c1C(=O)c1[nH]c(C(=O)O)c(O)c(=O)c1C2=O
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?