Using Cc1cn([C@@]2(COCc3ccccc3)C[C@H](OCCO)[C@@H](CO[Si](c3ccccc3)(c3ccccc3)C(C)(C)C)O2)c(=O)[nH]c1=O, ClC(Cl)(Cl)Cl to produce Cc1cn([C@@]2(COCc3ccccc3)C[C@H](OCCCl)[C@@H](CO[Si](c3ccccc3)(c3ccccc3)C(C)(C)C)O2)c(=O)[nH]c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.