Sildenafil citrate Synonyms:din-5-yl)-4-ethoxyphenyl)sulfonyl)-4-methyl-,2-hydroxy-1,2,3- ... -oxo-3-propyl-1h-pyrazolo(4,3-d)pyrimidin-5-yl)-4-ethoxyphenyl)sulfonyl)-4-methyl-,2-hydroxy-1,2,3 ... -oxo-3-propyl-1h-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxyphenyl]sulfonyl]-4-methylpiperazine citrate CAS: 171599-83-0 ...