Using CC(C)(C)OC(=O)NCCCN(CCc1ccccn1)C(=O)OC(C)(C)C, CCN(CCCBr)C(=O)OC(C)(C)C to produce CCN(CCCN(CCCN(CCc1ccccn1)C(=O)OC(C)(C)C)C(=O)OC(C)(C)C)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.