8-methoxy-1,3,7-trimethylpurine-2,6-dione

N-(5-ethoxy-1,3-dimethyl-2,4,6-trioxo-hexahydro-pyrimidin-5-yl)-N,N'-dimethyl-urea

氢碘酸

乙醚

4,5-dimethoxy-1,3,7,9-tetramethylpurine-2,6,8-trione