Using CC1(c2ccc(-c3c(I)c4nc(Br)cnc4n3COCC[Si](C)(C)C)cc2)OCCO1, [Li]CCCC to produce CCc1c(-c2ccc(C3(C)OCCO3)cc2)n(COCC[Si](C)(C)C)c2ncc(Br)nc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.