Using CC(C)(C)OC(=O)N1CCC(CN2CCN(CC3CCN(C(=O)OC(C)(C)C)CC3)CC2)CC1 to produce C1CC(CN2CCN(CC3CCNCC3)CC2)CCN1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.