Talk:Nor-

nor amino acid query (valine/norvaline, etc.)
So far, so good - the definition seems clear. However, how about the valine- norvaline pair? or leucine vs. norleucine? In these molecules CH2 group seems not to be replaced by hydrogen, but moves so, that the chain is no more branched. So is there any rule general enough to cover both cases? Dariusz Michalczyk darim@uwm.edu.pl —Preceding unsigned comment added by 213.184.4.41 (talk) 15:36, 10 June 2010 (UTC)

New nor structure example added
…but needs attention of a more experienced editor, in re: position relative to the other examples. Note, this nor-homo example is complex, but it must serve at present, until an example pair of structures can be found where a ring is contracted relative to another known substance. (Here, one ring is contracted, while the adjacent is expanded.) In any case, it is critically important to make clear that the "nor" can indicate removal of atoms from within rings (and not just peripheral methyl groups). Le Prof Leprof 7272 (talk) 17:38, 20 May 2014 (UTC)
 * See also opening nor-amino acid query, at top of page. If that contributor would like to learn Wikipedia, I would be glad to assist.  Le Prof  Leprof 7272 (talk) 17:39, 20 May 2014 (UTC)