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The quality of this chemical structure is disputed.
The dispute is about: Confusing that the same structural unit is drawn in different orientations (makes it hard to see what is actually changing). Suggest redrawing with the "red" two-carbon chain and R-group in same orientation each time ("v" vs "^" rotation). (Please discuss the issue on this file's talkpage)
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https://creativecommons.org/licenses/by/3.0CC BY 3.0 Creative Commons Attribution 3.0 truetrue
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