Using CCOC(=O)C1(Sc2nnc(Br)n2-c2ccc(C3CC3)c3ccccc23)CCC1 to produce O=C(O)C1(Sc2nnc(Br)n2-c2ccc(C3CC3)c3ccccc23)CCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.