Using CCOC(=O)[C@@H]1C[C@@H](CC=Cc2ccccc2)C(=O)N1C(=O)OC(C)(C)C to produce CCOC(=O)[C@@H]1C[C@@H](CCCc2ccccc2)C(=O)N1C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.