Using CCCc1c(O)ccc2c1OC(CCC(=O)OCC)(CCC(=O)OCC)CC2=O to produce CCCc1c(O)ccc2c1OC(CCC(=O)OCC)(CCC(=O)OCC)CC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.