Using CCCCOc1ccc2c(c1)CCN(c1ccc(N3CCC4(C3)OCCO4)cc1)C2=O to produce CCCCOc1ccc2c(c1)CCN(c1ccc(N3CCC(=O)C3)cc1)C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.