Using OCCBr, CC#CCOc1ccc(S(=O)(=O)N2CC2C(=O)OC)cc1 to produce CC#CCOc1ccc(S(=O)(=O)NC(COCCBr)C(=O)OC)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.