A form of vitamin A that is essential for vision and is a component of visual pigments.
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ethyl (2E,4E,6E,8E,10E)-5,9-dimethyl-11-(2,6,6-trimethylcyclohexen-1-yl)-2,4,6,8,10-undecapentaenoate
13-acetoxy-13-desmethylretinal 15,15-dimethyl acetal
