Using CCOC(=O)/C=C/c1ccc2c(=O)n(CC(C)C)c(CNC(=O)OC(C)(C)C)c(-c3ccccc3)c2c1 to produce CCOC(=O)CCc1ccc2c(=O)n(CC(C)C)c(CNC(=O)OC(C)(C)C)c(-c3ccccc3)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.