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in purpurin
在红紫素
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In basic condition E ring was converted into the cyclohexanedicarboxylic anhydride to form purpurin 18 derivatives by the air oxidation.
在碱性条件下，通过空气氧化将E环转变为环己二羧酸酐形成红紫素18甲酯衍生物；
youdao
Called rose madder or purpurin, the dye was apparently used in ancient civilizations for dying fabrics in oranges, reds and pinks.
ENGADGET: Scientists develop eco battery powered by root-extracted dye
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