Using [Cr+3], CC1=C(C)C(C)C(c2cccc3ccc(C)nc23)=C1C to produce CC1=C(C)C([Cr+2])(c2cccc3ccc(C)nc23)C(C)=C1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.