Using CCc1c(OCOC)cc(OCOC)c(Br)c1CCOCC(O)CO, COC(C)(C)OC to produce CCc1c(OCOC)cc(OCOC)c(Br)c1CCOCC1COC(C)(C)O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.