1-benzyl-7-(methylthio)-2H-pyrimido[4,5-d][1,3]oxazine-2,4(1H)-dione   、                                                                                      
N-butyl-3-azaisatoic anhydride                                                                                                                                                                                                                                                                                                          生成                                                 
1-butyl-3-(1,1-dioxido-4H-1,2,4-benzothiadiazin-3-yl)-4-hydroxy-1,8-naphthyridin-2(1H)-one   、                                                                                             8-benzyl-6-(1,1-dioxido-4H-1,2,4-benzothiadiazin-3-yl)-5-hydroxy-2-(methylsulfanyl)pyrido[2,3-d]pyrimidin-7(8H)-one