Some (or all) of the structures below are representations are of the same molecule. How many unique structures are shown (i.e., how many structures with different molecular formulae)?

Image: img6(dot)imageshack(dot)us/content.php?page=done&l=img6/5716/80685628.jpg&via=mupload

a. ) 1
b. ) 2
c. ) 3
d. ) 4
e. ) 5

I was only really able to see one molecule, with different orientations of its atoms in space. But I may be wrong. I'm not really sure how to approach this question

3 answers

Sorry, the correct link is: img6.imageshack.us/img6/5716/80685628.jpg
Neither URL gives the location of the web page. The code you provide looks like a folder and an image file in it. Not enough.
The website does not allow me to post internet addresses for some reason. Really, all you have to do is post the link into the address bar. It works for me.