Using CCCBr, CCOC(=O)CN1C(=O)c2ccc(Oc3ccc(O)cc3)cc2C1=O to produce CCCOc1ccc(Oc2ccc3c(c2)C(=O)N(CC(=O)OCC)C3=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.