Using C=CCC1(c2ccccc2)CCN(c2cccc(Br)c2)C(=O)O1, O=[O+][O-] to produce O=C1OC(CCO)(c2ccccc2)CCN1c1cccc(Br)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.