Using CB1OB(C)OB(C)O1, CCOC(=O)c1c(C)nc2c(OCc3ccccc3)cc(Br)cn12 to produce CCOC(=O)c1c(C)nc2c(OCc3ccccc3)cc(C)cn12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.