Erythrulose

D-Erythrulose (also known as erythrulose) is the organic compound with the formula HOCH₂C(O)CH(OH)CH₂OH (alternative notation as C₄H₈O₄). As a ketone-containing monosaccharide, it is classified as a ketose and tetrose.

Erythrulose is a colorless, sweet-tasting, water-soluble solid. Among the sugars, it is relatively obscure, being described as a "novelty tetrose".

In 2026, broadbandspectral surveys using large Earth-based telescopes detected erythrulose on dust grains in molecular clouds near the center of the Milky Way.