Using O=C([O-])[O-], C=C(OCC)C1(NS(=O)C(C)(C)C)c2cc(Br)ccc2CC12CCC(OC)CC2 to produce CCOC(=O)C1(NS(=O)C(C)(C)C)c2cc(Br)ccc2CC12CCC(OC)CC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.