Using CCI, CCCC[C@@H](O)[C@H](C(=O)N[C@@H](Cc1c[nH]c2ccccc12)C(=O)O)c1ccc2c(c1)OCO2 to produce CCCC[C@@H](O)[C@H](C(=O)N[C@@H](Cc1c[nH]c2ccccc12)C(=O)OCC)c1ccc2c(c1)OCO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.