Neuropharmacology & Neurotherapeutics
Levodopa
Apr. 03, 2021
This is an image preview.
Start a Free Account
to view the full image.
-
Nearly 3,000 illustrations, including video clips of neurologic disorders.
-
Every article is reviewed by our esteemed Editorial Board for accuracy and currency.
-
Full spectrum of neurology in 1,200 comprehensive articles.
-
Listen to MedLink on the go with Audio versions of each article.
Structural formulas of the open-chain and cyclic forms of the pentose ribose
Several of the forms of D-ribose: the open-chain form (top), and Haworth projections of two of the four cyclic forms, alpha-D-ribopyranose (middle), and beta-D-ribofuranose (bottom). Ribose exists as a mixture of cyclic forms in equilibrium with its linear form, and these readily interconvert, especially in aqueous solution. The relative abundance of forms of ribose in solution is as follows: beta-D-ribopyranose (59%), alpha-D-ribopyranose (20%), beta-D-ribofuranose (13%), alpha-D-ribofuranose (7%), and open-chain (0.1%). The name "ribose" refers collectively to all of these forms, although the more specific names for each form are used when required. D-ribose was discovered in 1909 by Lithuanian-American biochemist Phoebus Levene. (Public domain.)