Using COC(=O)[C@H](CNC(=O)OCC[Si](C)(C)C)C(C)C to produce CC(C)[C@@H](CNC(=O)OCC[Si](C)(C)C)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.