Using COC(=O)C1=CC2CC[C@H]3[C@@H]4CC[C@H](C(=O)O)[C@@]4(C)CC[C@@H]3[C@@]2(C)CC1 to produce COC(=O)C1=CC2CC[C@H]3[C@@H]4CCC[C@@]4(C)CC[C@@H]3[C@@]2(C)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.