1-Methyl-3-(5-nitro-2-furyl)pyrazol-4-carboxaldehydoxim   、                                                                                      
1-Ethyl-3-(5-nitro-2-furyl)pyrazol-4-carboxaldehydoxim   、                                                                                      
1-Isopropyl-3-(5-nitro-2-furyl)pyrazol-4-carboxaldehydoxim   、                                                                                      
3-(5-Nitro-2-furyl)-1-phenylpyrazol-4-carboxaldehydoxim                                                                                                                                                                                                                                                                                                          以respectively, results in the corresponding preparation of: 1-ethyl-3-(5-nitro-2-furyl)pyrazole-4-carboxaldehyde-(O-acetyloxime), 1-isopropyl-3-(5-nitro-2-furyl)pyrazole-4-carboxaldehyde-(O-acetyloxime), and 3-(5-nitro-2-furyl)-1-phenylpyrazole-4-carboxaldehyde-(O-acetyloxime)的产率得到1-ethyl-3-(5-nitro-2-furyl)pyrazole-4-carboxaldehyde-(O-acetyloxime)