Using CCOC(=O)C(OCC)OCC, CC(C)(C)[Si](C)(C)Oc1cccc(C[Mg]Cl)c1 to produce CCOC(OCC)C(=O)Cc1cccc(O[Si](C)(C)C(C)(C)C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.