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The envelope conformation has four atoms in a plane while the twist form only has three.
The five-membered ring adopts a slightly distorted envelope conformation, the angle between the Ga2N2 and N2O moieties being 13.9°.
The furanose rings of the 3-deoxy-ribo and lyxo derivatives are found to preferentially exist in an envelope conformation in which C-4 is displaced from the plane of the ring.
The sugar has the opposite anti arrangement in the β-carboline 1 and the conformation of the sugar is unusual; it is close to an envelope conformation with O(4′) being the atom out of the plane.
There is a significant flattening of the two Hg3S3 rings with two axial substituents into an envelope conformation; each has two torsion angles less than 25°, instead of the ideal values of ±60° in adamantane.
The early transition state proposed for the thermal ene reaction of propene with formaldehyde has an envelope conformation, with a C-O-H angle of 155 , as calculated at the 3-21G level of theory.