6-Amino-1-(4-chloro-2-methylphenyl)-3-methylpyrimidine-2,4-dione                                                                                                                                                              在
                                                                                                                                                                                 
sodium hydrogensulfite   、                                                                                                  
溶剂黄146   、                                                                                                  sodium nitrite                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
ammonium hydroxide                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                生成                                                 [3-(4-Chloro-2-methyl-phenyl)-1-methyl-2,6-dioxo-2,3,6,9-tetrahydro-1H-purin-8-yl]-carbamic acid ethyl ester