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retinol

vitamin A1alcohol; 2,6,6-trimethyl-1-(9'-hydroxy-3',7'-dimethylnona-1',3',5',7'-tetraenyl)cyclohex-1-ene;a half-carotene bearing the b (or beta-ionone) form of the cyclic end group and a CH2OH at the C-15 position (numbering as in carotenoids) or 9'-position (numbering as a nonyl side chain on a cyclohexene ring); an intermediate in the vision cycle, it also plays a role in growth and differentiation.

See: dehydroretinol.

Synonym: vitamin A1 alcohol, vitamin A1.

retinol dehydrogenase, an oxidoreductase catalyzing interconversion of retinal and nADH to retinol and NAD_.