Structure of vitamin A1 H3C CH3 CH3 CH3 CH3 Vitamin a, has four double bounds all trans)at positions 2, 4, 6, 8 on unsaturated side chain containing 9 carbon atoms There are three methyl groups at positions 2 6,6 of Cyclohexenyl ring attached to position 9 on the side chainStructure of Vitamin A1 • Vitamin A1 has four double bounds (all trans ) at positions 2,4,6,8 on unsaturated side chain containing 9 carbon atoms. • There are three methyl groups at positions 2´ , 6´ , 6´ of Cyclohexenyl ring attached to position 9 on the side chain. H3C CH3 CH3 OH CH3 CH3