2,3,8,9-Tetrahydro-5-phenyl-9-(phenylmethylene)-5H,6H-thiazolo[3,2-a]thiopyrano[4,3-d]pyrimidine   、                                                                                      
顺丁烯二酸                                                                                                                                                              在
                                                                                                                                                                                 
乙腈                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                                                        以gives 3.0 g (77%) of cream colored product, m.p. 143°-145°的产率得到2,3,8,9-Tetrahydro-5-phenyl-9-(phenylmethylene)-5H,6H-thiazolo[3,2-a]thiopyrano[4,3-d]pyrimidine, maleate salt