Keywords: Sildenafil.png Skeletal formula of sildenafil Viagra 1-4-ethoxy-3- 6 7-dihydro-1-methyl- 7-oxo-3-propyl-1H-pyrazolo4 3-dpyrimidin-5-yl phenylsulfonyl-4-methylpiperazine citrate; C<sub>22</sub>H<sub>30</sub>N<sub>6</sub>O<sub>4</sub>S · C<sub>6</sub>H<sub>8</sub>O<sub>7</sub> Author date of creation self made by Ben Mills at 12 48 13 March 2006 UTC Source user-created image Comments high-resolution black and white PNG; ChemDraw / Photoshop en wikipedia 2004-06-21 MattKingston wikipedia en Later versions were uploaded by Benjah-bmm27 at http //en wikipedia org en wikipedia Sildenafil svg Benjah-bmm27 original upload log page en wikipedia Sildenafil png 2006-03-13 12 53 Benjah-bmm27 2204×1097×8 45330 bytes <nowiki></nowiki> 2004-06-21 08 10 MattKingston 470×186×2 2158 bytes <nowiki>Chemical structure of sildenafil </nowiki> Sildenafil |