Using CC(O)[C@H]1CC[C@H]2[C@@H]3[C@@H](C)C[C@H]4NC(=O)CC[C@]4(C)[C@H]3CC[C@]12C to produce CC(=O)[C@H]1CC[C@H]2[C@@H]3[C@@H](C)C[C@H]4NC(=O)CC[C@]4(C)[C@H]3CC[C@]12C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.