title: The synthesis of 2,4-diketo-5-phenyl-  5 -7-oxa-1,3-diazabicyclo(4.4.0)decane and 2,4-diketo-3-phenyl-  5 -7-oxa-1,5-diazabicyclo(4.4.0)decane.
mesh_terms: D001463:Barbiturates / Q000138:chemical synthesis*; D001952:Bridged-Ring Compounds; D008722:Methods
chemical_list: D001463:Barbiturates; D001952:Bridged-Ring Compounds