Using COC(=O)C(O)(c1cccs1)c1cccs1, CN(C(=O)OC(C)(C)C)[C@H]1CC[C@H](O)CC1 to produce CN(C(=O)OC(C)(C)C)[C@H]1CC[C@H](OC(=O)C(O)(c2cccs2)c2cccs2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.