p. 4633
(1962)p. 677 - 680
(2007/10/03)5-acetoxy-9-acetyl-4-chloro-4,5-dihydrouric acid
9-acetyl-2-methoxy-1,7-dimethyl-7,9-dihydro-1H-purine-6,8-dione
4,5-diethoxy-1,7-dimethyl-tetrahydro-purine-2,6,8-trione
5-chloro-1,7-dimethyl-5,7-dihydro-3H-purine-2,6,8-trione
4,5-dimethoxy-1,7-dimethyl-tetrahydro-purine-2,6,8-trione