| 摘要 |
The invention concerns sildenafil N-oxide as prodrug, to pharmaceutical compositions containing this compound, to methods for preparing it, and methods for preparing compositions. The invention relates to 1-[[3-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d] pyrimidin-5-yl)-4-ethoxyphenyl]sulfonyl]-4-methyl-4-oxido-piperazine having formula (1) and pharmacologically acceptable salts, hydrates and solvates thereof. The invention also relates to uses of the compound, and compositions containing it, particularly for the manufacture of medicaments useful in the treatment of affections or diseases effectively treatable-albeit with side effects-with sildenafil.
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