Using COC(=O)CN1C[C@H](Oc2cnc(C3CC3)cn2)C[C@H]1CN=[N+]=[N-] to produce O=C1CN2C[C@H](Oc3cnc(C4CC4)cn3)C[C@H]2CN1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.