2,3-O-isopropylidene-5-O-(1-methoxy-1-methyl-ethyl)-D-ribono-1,4-lactone

5-O-(1-Methoxy-1-methylethyl)-2,3-O-(1-methylethylidene)-D-ribonic Acid γ-Lactone is an intermediate in the synthesis of β-Pseudouridine, an isomer of the nucleoside uridine found in all species and in many classes of RNA except mRNA.