The molecule is a butan-4-olide that is dihydrofuran-2-one substituted at C-3 and C-4 by hydroxy groups (the 3S,4R-diastereomer). It is a diol and a butan-4-olide. It is an enantiomer of a L-threonolactone.
(3S,4R)-3,4-dihydroxyoxolan-2-one