Using CC(C)C[Mg]Br, COC(=O)c1ccc(C=Nc2cnc(-n3cc(C(F)(F)F)cn3)c(C)c2)nc1 to produce COC(=O)c1ccc(C(CC(C)C)Nc2cnc(-n3cc(C(F)(F)F)cn3)c(C)c2)nc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.