Using BrCCCBr, CC(C)c1oc2c(O)c(NC=O)ccc2c(=O)c1-c1ccc(Cl)cc1 to produce CC(C)c1oc2c3c(ccc2c(=O)c1-c1ccc(Cl)cc1)N(C=O)CCCO3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.