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groups with hydrogen atoms.

Classification

The aldopentoses are a subclass of the pentoses which, in the linear form, have the carbonyl at carbon 1, forming an aldehyde derivative with structure H-C(=O)-(CHOH)₄-H. The most important example is ribose. The ketopentoses instead have the carbonyl at positions 2 or 3, forming a ketone derivative with structure H-CHOH-C(=O)-(CHOH)₃-H

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