Using COC(=O)C1(NC(=O)Cc2cc(Br)ccc2C)CCC2(CC1)OCCO2 to produce Cc1ccc(Br)cc1C1=C(O)C2(CCC3(CC2)OCCO3)NC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.