<prompt> Retinol is a primary alcohol containing:-Alpha-ionone ringBeta-ionone ringOne isoprenoid unitTwo double bonds  <response>: Retinol vitamin A alcohol: lt is a primary alcohol containing beta-ionone ring. The side chain has two isoprenoid units, four double bonds and one hydroxyl group. Retinol is present in animal tissues as retinyl ester with long chain fatty acidsKey Concept:Retinol is a vitamin A alcohol containing beta-ionone ring 