Using O=C(Cc1ccccc1)c1ccc(O)cc1, BrCCOCc1ccccc1 to produce O=C(Cc1ccccc1)c1ccc(OCCOCc2ccccc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.