different illustrations of alpha-D-Glucopyranose: Tollens (1); Haworth (2); chair (3); absolut stereo (4)
<a href="//commons.wikimedia.org/wiki/User:Yikrazuul" title="User:Yikrazuul">Yikrazuul</a>
3.5.09
<span class="int-own-work" lang="en">Own work</span>