Abstract Stereoselective, total synthesis of O-α-d-galactopyranosyl-(1→ 4)-O-β-d- galactopyranosyl-(1→ 4)-O-β-d-glucopyranosyl-(1→ 1)-N-tetracosanoyl-[2S, 3R, 4E (and 4Z)]-sphingenine and O-α-d-galactopyranosyl-(1→ 3)-O-β-d-galactopyranosyl-(1→ 4)-O-β-d- glucopyranosyl-(1→ 1)-N-tetracosanoyl-(2S, 3R, 4E)-sphingenine was achieved by using O- (2, 3, 4, 6-tetra-O-acetyl-α-d-galactopyranosyl)-(1→ 4)-O-(2, 3, 6-tri-Od-galactopyranosyl)-( ...