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Conformational isomers
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Description
These models show two of the possible ring conformations for b-D-ribofuranose.

In both of them, C-1, O, and C-4 define a plane.

In the C-2 endo conformation (a), C-2 is above the plane.

In the C-3 endo conformation (b), C-3 is above the plane.

These isomers are the two most common conformations for ribose and deoxyribose in nucleic acids.

A C-3 exo conformation would look like the figure in (b), but C-3 would be flipped below the plane
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