Alizarin dye,obtained from the root of the madder plant,is an anthraquinone derivative. Its structure corresponds to:
- A$1, 2-$dihydroxy anthraquinone
- B$2, 3-$dihydroxy anthraquinone
- C$1, 4-$dihydroxy anthraquinone
- D$1-$hydroxy anthraquinone
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