Using CCOC(=O)C(Cc1ccccc1)C(=O)OCC, C=CC(=O)OC(C)(C)C to produce CCOC(=O)C(CCC(=O)OC(C)(C)C)(Cc1ccccc1)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.