| 摘要 |
The present invention comprises (I) 1-(1-(2-ethoxyethyl-3-ethyl-7-(4-methylpyridin-2-ylamino)-lH-pyrazolo[4,3-d]pyrimidin-5-yl)piperidine-4-carboxylic acid and its salts. The invention further comprises pharmaceutical compositions, methods of treatment, and synthetic methods relating to Formula (I). Formula (I) is used to inhibit the PDE5 enzyme.
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