Using CCOC(=O)Cn1c(C(=O)OCC)c2c(c1C(=O)OCC)OCCCO2 to produce O=C(O)Cn1c(C(=O)O)c2c(c1C(=O)O)OCCCO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.