Using COCCOCCl, C=CCOC(=O)c1ccc(OCC(=O)c2ccc3c(c2)C(C)(C)CCC3(C)C)cc1O to produce COCCOCOc1cc(OCC(=O)c2ccc3c(c2)C(C)(C)CCC3(C)C)ccc1C(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.