Using COC(=O)CCc1ncc(OCC(=O)OC)c(C(=O)OC)c1C(=O)OC to produce COC(=O)CCc1ncc2oc(C(=O)OC)c(O)c2c1C(=O)OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.