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A homologue of fluorescein and a number of its derivatives have been prepared by the condensation of 2‐mcthylrcsorcinol with phthalic and substituted phthalic anhydrides. Bromination and iodination of 4 :5‐dimcthylfluorcsccin have given compounds corresponding to the dyes eosin and crythrosin.
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Burton et al. (1948) studied this question.
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