COC(=O)Cc1c(-c2c(CC(=O)OC)c3ccccc3n2C2OC(COC3OC(COC(C)=O)C(OC(C)=O)C(OC(C)=O)C3OC(C)=O)C(O)C(O)C2O)[nH]c2ccccc12
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?