Using C1CCNC1, CC(C)(C)OC(=O)N1CCC(C(=O)CBr)CC1 to produce CC(C)(C)OC(=O)N1CCC(C(=O)CN2CCCC2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.