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Ring pucker is a technical term used in chemistry to describe the tendency of cyclic molecules to fold out of plane to relieve torsional strain.

Carbohydrates
In sugar chemistry, five-membered rings such as the furanose form of ribose are more flexible and have a greater tendency to pucker than six-membered rings such as the pyranose form of glucose. Whereas the six-membered ring adopts a stable chair or boat conformation (see conformational isomerism) enhancing the anomeric effect, five-membered ring pucker results in sugars and sugar analogs of the furanose form having a less pronounced anomeric effect.

Category:Carbohydrate chemistry