| —— | 
                                        2-acetyl-3-methoxy-9,9-dimethyl-6,7-dihydropyrimido[2,1-c][1,4]oxazin-4(9H)-one | 
                                        1289648-86-7 | 
                                        C12H16N2O4 | 
                                        252.27 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        2-(2-Bromoacetyl)-3-methoxy-9,9-dimethyl-6,7-dihydropyrimido[2,1-c][1,4]oxazin-4-one | 
                                        1289648-88-9 | 
                                        C12H15BrN2O4 | 
                                        331.166 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        N,3-dimethoxy-N,9,9-trimethyl-4-oxo-4,6,7,9-tetrahydropyrimido[2,1-c][1,4]oxazine-2-carboxamide | 
                                        1289648-84-5 | 
                                        C13H19N3O5 | 
                                        297.311 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        2-(1-(4-fluorobenzyl)-1H-imidazol-4-yl)-3-methoxy-9,9-dimethyl-6,7-dihydropyrimido[2,1-c][1,4]oxazin-4(9H)-one | 
                                        1289648-87-8 | 
                                        C20H21FN4O3 | 
                                        384.41 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        2-(1-(4-fluorobenzyl)-1H-imidazol-4-yl)-3-hydroxy-9,9-dimethyl-6,7-dihydropyrimido[2,1-c][1,4]oxazin-4(9H)-one | 
                                        1289649-08-6 | 
                                        C19H19FN4O3 | 
                                        370.383 |