Using O=C(O)c1cc(O)c2c(c1)OCO2, Cc1cccc(CCBr)c1 to produce Cc1cccc(CCOC(=O)c2cc(OCCc3cccc(C)c3)c3c(c2)OCO3)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.