Using O=C1CCC(=O)N1Cl, CO[C@H]1CC[C@H]2[C@@H]3CC[C@H]4C[C@@H](O)CC[C@]4(C)[C@H]3CC[C@]12C to produce CO[C@H]1CC[C@H]2[C@@H]3CC[C@H]4C[C@H](Cl)CC[C@]4(C)[C@H]3CC[C@]12C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.