Using O=C1NC(=O)c2ccccc21, CS(=O)(=O)OCCOc1cccc(Br)c1 to produce O=C1c2ccccc2C(=O)N1CCOc1cccc(Br)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.