Using O=Cc1ccccc1, NCCNC(=O)C1CCN(c2c(Cl)cncc2Cl)CC1 to produce O=C(NCCNCc1ccccc1)C1CCN(c2c(Cl)cncc2Cl)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.