Using O=C(O)c1n[nH]c2cc(Cl)c(Br)cc12, OB(O)c1ccc2c(c1)OCCO2 to produce O=C(O)c1n[nH]c2cc(Cl)c(-c3ccc4c(c3)OCCO4)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.