Using C[C@]12CC[C@H]3[C@@H](C[C@H](O)C4C[C@H](OC=O)CC[C@@]43C)[C@@H]1CC[C@@H]2O to produce C[C@]12CC[C@@H](OC=O)CC1C(=O)C[C@@H]1[C@@H]2CC[C@]2(C)C(=O)CC[C@@H]12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.