Using C=CCC(CI)c1c(-c2ccccc2)c(C)c(C#N)c2nc(C3CC3)oc12, C=C[Mg]Br to produce C=CCC(CC=C)c1c(-c2ccccc2)c(C)c(C#N)c2nc(C3CC3)oc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.