Using C=CCBr, CC(C)(C)[Si](C)(C)N1C(=O)C[C@H]1C(=O)O to produce C=CC[C@H]1C(=O)N([Si](C)(C)C(C)(C)C)[C@@H]1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.