Using CC(C)(C)OC(=O)Nc1ccc(CN2CCNC(=O)C2(C)C)cn1 to produce CC(C)(C)OC(=O)Nc1ccc(CN2CCNCC2(C)C)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.