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Draw the fischer projections of the four aldotetroses. draw the d sugar on the left and its l isomer directly to the right of it. switch between an aldose and a ketose by

User FatalFlaw
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An Aldotetrose is a tetrose sugar (4 Carbons) with an aldehyde functional group on the first atom.
The D- compound contains the last bottom asymmetric -OH group at the right side of the Fischer's projection. The L-compound contains the last bottom asymmetric -OH at the left side of the Fischer projection.
So the Fischer's projection of the four aldotetroses is as follow:

Draw the fischer projections of the four aldotetroses. draw the d sugar on the left-example-1
User Hoball
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