Cc1cc(=O)c2c(O)cc3c(c2o1)CC=C(COC1OC(COC2OC(CO)C(O)C(O)C2O)C(O)C(O)C1O)CO3
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?