Using COc1ccc(-c2ccc3c(c2)COC3=O)c(O)c1OCC1CC1, COCC1(CBr)COC1 to produce COCC1(COc2c(-c3ccc4c(c3)COC4=O)ccc(OC)c2OCC2CC2)COC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.