1,3-oxazine
                            Order
                            24384-27-8
                            
                                Cyclopenta[7,8]phenanthro[2,3-c][1,2]oxazine,6'H-androstano[3,2-c][1,2]oxazine deriv.
                            
                        
                        
                        
                        
                        
                        
                            Order
                            41410-83-7
                            
                                Cyclopenta[7,8]phenanthro[2,1-b][1,4]oxazine,4'H-estr-3-eno[3,4-b][1,4]oxazine deriv.
                            
                        
                        
                        
                        
                        
                            Order
                            51158-07-7
                            
                                Cyclopenta[7,8]phenanthro[2,1-d][1,3]oxazine,6'H-pregn-3-eno[3,4-d][1,3]oxazine deriv.