what is the big difference among Sildenafil and Vardenafil?

Problem by : what is the variation in between Sildenafil and Vardenafil?

Ideal response:

Solution by Kaviani999
Various molecule.
http://en.wikipedia.org/wiki/File:Sildenafil.svg
http://en.wikipedia.org/wiki/File:Vardenafil.svg

Examine the six ring on the appropriate of every pic. They are really distinct.

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