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In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Like quaternary amines, they can also be used as phase transfer catalysts in liquid-liquid extractions, and Huang used a mixture of one of these compounds and cyclodextrin to separate primary amines via capillary electrophoresis. Polyglymes are a linear version of them, and three-dimensional ones are called cryptands, which are often used as ionophores. Charles Pederson first synthesized them by linking several catechols together, and isolated a product that could complex with potassium ions. Dioxane is the simplest example of, FTP, this type of macrocycle composed of repeating ethyleneoxy units, a special type of ether.
Output:
Science