COc1nc2c(c(O)c(C)c(=O)n2OC2OC(COC(C)=O)C(OC(C)=O)C(OC(C)=O)C2OC(C)=O)c(=O)n1C
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?