Using C[C@]12CC[C@@H](O)C[C@@H]1CC[C@H]1[C@@H]3CC[C@H](C(=O)OCCCN4CCOCC4)[C@@]3(C)CC(=O)[C@@H]12 to produce C[C@]12CCC(=O)C[C@@H]1CC[C@H]1[C@@H]3CC[C@H](C(=O)OCCCN4CCOCC4)[C@@]3(C)CC(=O)[C@@H]12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.