Using CCOC(=O)c1c(C(=O)OCC)c(-c2ccc3c(c2)OCO3)c2c3c(ccc2c1O)OCO3 to produce O=C1OCc2c1c(-c1ccc3c(c1)OCO3)c1c3c(ccc1c2O)OCO3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.