Using COC(=O)Cc1cccc(CNCCC2CCN(c3nc4ccc(Cl)cc4s3)CC2)c1 to produce O=C(O)Cc1cccc(CNCCC2CCN(c3nc4ccc(Cl)cc4s3)CC2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.