1-Nitroso-3-nitro-1-butylguanidine 13010-08-7 Guanidine, 1-butyl-3-nitro-1-nitroso- Guanidine, N-butyl-N'-nitro-N-nitroso- N-Butyl-N'-nitro-N-nitrosoguanidine NSC 24639 NSC24639