89975-22-4 Guanidine, 1-[2-(2-nitramino-2-imidazolin-1-yl)ethyl]-3-nitro-1-nitroso- Guanidine, N-[2-[4,5-dihydro-2-(nitroamino)-1H-imidazol-1-yl]ethyl]-N'-nitro-N-nitroso- NSC40590