Using CN1Cc2c(ccc3c2NC(=O)C3=O)C(c2ccccc2)C1, OCCO to produce CN1Cc2c(cc3c4c2NC(=O)C4OCCO3)C(c2ccccc2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.