Using CCc1c(C)nc(-c2ccc(Cl)s2)nc1Nc1ccc(Br)c(CO)c1, CC(=O)Cl to produce CCc1c(C)nc(-c2ccc(Cl)s2)nc1Nc1ccc(Br)c(COC(C)=O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.