title: The synthesis of bicyclo(4,3.0) nonanebarbituric and -thiobarbituric acid derivatives and a bicyclo (4,4.0) decanebarbituric acid derivative.
mesh_terms: D000478:Alkylation; D000927:Anticonvulsants / Q000138:chemical synthesis*; D001463:Barbiturates / Q000138:chemical synthesis*; D001952:Bridged-Ring Compounds / Q000138:chemical synthesis*; D055598:Chemical Phenomena; D002621:Chemistry; D008722:Methods; D013057:Spectrum Analysis; D013440:Sulfides / Q000138:chemical synthesis
chemical_list: D000927:Anticonvulsants; D001463:Barbiturates; D001952:Bridged-Ring Compounds; D013440:Sulfides