Chemically, Ribose is a single-ring 5-carbon (pentose) sugar. Ribose is an essential component of ribonucleic acid (RNA). It can exist in D and L form (see fig). D-ribose is a naturally occurring form which is present in RNA. L-ribose is a synthetic ribose.

Molecular conformations of Ribose

Properties D-(−)-Ribose L-(+)-Ribose
Molecular formula C5H10O5 C5H10O5
Molecular Weight 150.13 150.13
CAS Number 50-69-1 24259-59-4
Beilstein/REAXYS Number 1723081 1723084
PubChem Substance ID 24899349 24899368


From Sigma
Specification: D-(−)-Ribose, 98%
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From Sigma
Specification: D-(−)-Ribose, ≥99%
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From Sigma
Specification: L-(+)-Ribose
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Banfalvi et al., 2020. Ribose Selected as Precursor to Life. DNA Cell Biol. 39 (2), 177-186. PMID-31804855; Full-Text Link: liebertpub (download PDF)

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