Using C[C@]12CC[C@@H]3[C@H]4CCC(=O)C5OC54CC[C@H]3[C@@]13C[C@H]3C[C@@H]2O, Cl to produce C[C@]12CC[C@H]3[C@@H](CCC4=C(Cl)C(=O)CC[C@@H]43)[C@@]13C[C@H]3C[C@@H]2O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.