Using C[C@]1(O)CC[C@H]2[C@@H]3CC[C@H]4CC(=O)CC[C@]4(CO)[C@H]3CC[C@@]21C, CC(S)S to produce C[C@]1(O)CC[C@H]2[C@@H]3CC[C@H]4CC5(CC[C@]4(CO)[C@H]3CC[C@@]21C)OCCS5, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.