Using CC(C)(C)OC(=O)CCCBr, CCOC(=O)c1cccc(Sc2c(C3CC3)n(-c3cnn(CCN)c3)c3c(F)c(Cl)ccc23)c1F to produce CCOC(=O)c1cccc(Sc2c(C3CC3)n(-c3cnn(CCCC(=O)OC(C)(C)C)c3)c3c(F)c(Cl)ccc23)c1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.