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)

See also Wikipedia:Manual of Style/Chemistry/Structure drawing

Usage: {{low quality chem|reason}}

If there is a better version of the image available, please link it (e.g. using {{Superseded}} or {{Vector version available}}).