Using C[Si](C)(C)CCOCn1c(C2CC2)nc(Br)c1-c1ccnc(Cl)n1, C[C@@H](CN)NC(=O)OC(C)(C)C to produce C[C@@H](CNc1nccc(-c2c(Br)nc(C3CC3)n2COCC[Si](C)(C)C)n1)NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.