If the penultimate carbon of a carbohydrate has the hydroxyl group pointing right,it is considered a D sugar.

Name: If the penultimate carbon of a carbohydrate has the hydroxyl group pointing right,it is considered a D sugar.
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In the Fischer projection of carbohydrates, if the hydroxyl group on the penultimate (second-to-last) carbon atom is pointing to the right, the sugar is classified as a D-sugar. This is a standard convention for determining the D or L configuration of sugars.

If the Penultimate Carbon of a Carbohydrate Has the Hydroxyl