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D and L configuration of sugars: Draw the given sugar (aldose) in the Fischer projection with the most oxidized carbon at the top (i.e. aldehyde carbon). If it is a ketose, make the closest terminal carbon to the keto group at the top. Now: if the $\ce{OH}$ on the bottom chiral center points to the right hand side, the sugar is referred to as D-sugar. if ...

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