Is 2-Anthracenecarboxylic acid, 9,10-dihydro-4,5-dihydroxy-9,10-dioxo- vegan?

Rhein is also known as 2-Anthracenecarboxylic acid, 9,10-dihydro-4,5-dihydroxy-9,10-dioxo-.

Rhein is a naturally occurring anthraquinone compound found in plants such as rhubarb and senna, also produced synthetically, used for its coloring and cosmetic properties.

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