I learned the website about chemical structure. Especially 3D structure
(Appropriate citation to prevent plagiarism)
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This molecule is from molview.org created by Herman Bergwerf
The vitamin a structure is from this link
https://molview.org/?cid=445354
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The following texts in "italic" are from wikipedia
https://en.wikipedia.org/wiki/Vitamin_A
Vitamin A is a fat-soluble vitamin that is an essential nutrient. The term "vitamin A" encompasses a group of chemically related organic compounds that includes retinol, retinyl esters, and several provitamin (precursor) carotenoids, most notably β-carotene (beta-carotene).[3][4][5][6] Vitamin A has multiple functions: growth during embryo development, maintaining the immune system, and healthy vision. For aiding vision specifically, it combines with the protein opsin to form rhodopsin, the light-absorbing molecule necessary for both low-light (scotopic vision) and color vision.[7]
My opinions: I do not know that vitamin A is a family until this moment. And the beta-carotene is the best plant-source of vitamin A
