Wiktionary
levulinic acid
n. (context organic compound English) 4-oxopentanoic acid, a keto acid used as a synthetic intermediate.
Wikipedia
Levulinic acid
Levulinic acid, or 4-oxopentanoic acid, is an organic compound with the formula CHC(O)CHCHCOH. It is classified as a keto acid. This white crystalline solid is soluble in water and polar organic solvents. It is derived from degradation of cellulose and is a potential precursor to biofuels.