Using O=C1CCC(=O)N1, O=C(c1ccccc1)C(OCCBr)(OCCBr)c1ccccc1 to produce O=C1CCC(=O)N1CCOC(OCCN1C(=O)CCC1=O)(C(=O)c1ccccc1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.