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**Molecular formula:** C₅H₁₀O₄ **Molar mass:** 134.13 g/mol **Description:** 2-Deoxy-D-ribose, or deoxyribose, is a monosaccharide belonging to the pentose group (i.e., it contains five carbon atoms in its molecule). It is derived from D-ribose by replacing the hydroxyl group (-OH) on the second carbon atom with a hydrogen atom (H), resulting in a modified sugar. **Applications:** 2-deoxy-D-ribose plays a crucial role in biology as an integral component of deoxyribonucleic acid (DNA), which encodes the genetic information of all living organisms. **Occurrence:** In living organisms, 2-deoxy-D-ribose is found as part of the DNA molecule.