O-Isobutyl ((3aR,7S,9S,9aR)-2,2,7-Trimethylhexahydro-[1,3]dioxolo[4’,5’:5,6]pyran[3,2-d][1,3]dioxin-9-yl) Sulfite is an intermediate used in the synthesis of D-Galactose-3-sulfate (G155290), which is an sulfated conjugate of D-Galactose (G155250), a epimer of Glucose (G595000) that is found in milk and sugar beets as well as being synthesized by the body.