Using CCOC(=O)c1ccc(-c2cnn3c(-c4cccc(-n5cccn5)c4)cnc3c2)cc1, NCCO to produce O=C(NCCO)c1ccc(-c2cnn3c(-c4cccc(-n5cccn5)c4)cnc3c2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.