Using Cc1cccc(-c2nn3c(c2Br)CCC3)n1, OB(O)c1ccc2c(c1)OCO2 to produce Cc1cccc(-c2nn3c(c2-c2ccc4c(c2)OCO4)CCC3)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.