Using COC(=O)c1c(NC(=O)C(C)(C)C)cccc1OCCC(=O)O to produce COC(=O)c1c(NC(=O)C(C)(C)C)ccc2c1OCCC2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.