Esters of dihydroqinghaosu (2) and its 4,6-epoxy analog 5 were prepared with diacetyldihydrofluorescein (DMIF).Both esters 3 and 5 Can be separated by tlc and made visible on plates after exposure to ammonia and iodine vapors as deep red colored spots.
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Brossi et al. (1984) studied this question.
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