4-Benzoyl-3-hydroxy-5-nitro-benzoesaeure   、                                                                                      
3-Hydroxy-4-(4'-methylbenzoyl)-5-nitrobenzoesaeure                                                                                                                                                                                                                                                                                                          以ethyl 3-hydroxy-4-(4'-methylbenzoyl)-5-nitrobenzoate is obtained with a melting point of 145°-147° C.的产率得到ethyl 3-hydroxy-4-(4'-methylbenzoyl)-5-nitrobenzoate