Using C[C@@H]1CN(CCCN2CCC3(CC3)[C@H](O)C2)C(=O)CCN1C(=O)OC(C)(C)C to produce C[C@@H]1CN(CCCN2CCC3(CC3)[C@H](O)C2)C(=O)CCN1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.