Using C1=COCCC1, OC(c1cccc(Cl)c1)c1c(Cl)sc(Cl)c1Br to produce Clc1cccc(C(OC2CCCCO2)c2c(Cl)sc(Cl)c2Br)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.