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