Using O=C(O)COc1ccc(Cl)cc1, Cn1c(=O)c2c(ncn2CC(O)CO)n(C)c1=O to produce Cn1c(=O)c2c(ncn2CC(O)COC(=O)COc2ccc(Cl)cc2)n(C)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.