Using O=C(Nc1ccc(Br)cc1)c1cccn(C2CCc3c(O)cccc32)c1=O, OCCCl to produce O=C(Nc1ccc(Br)cc1)c1cccn(C2CCc3c(OCCO)cccc32)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.