C/C(=C/Cc1c(O)cc2oc(C)cc(=O)c2c1O)COC1OC(CO)C(O)C(O)C1O
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?