The difference in solubility between 5'-cholesterol (2170) and 5'-cholesterol-TEG (2189) arises from the more hydrophilic TEG linker. This is enough to make 5'-cholesterol-TEG (2189) soluble in acetonitrile. 5-Tocopherol (2163) is more similar in nature to 5'-cholesterol (2170) in that there is no hydrophilic group in the molecule therefore is not soluble in acetonitrile.
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