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Less than 1 % of the total brain excretion of 24OHC occurs via the cerebrospinal fluid ( CSF ) whereas almost all 27 - hydroxycholesterol ( 27OHC ) excretion is dependent on the function of the blood - cerebrospinal fluid barrier .
 Chemical: 24OHC; Chemical: 27 - hydroxycholesterol; Chemical: 27OHC
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: 24OHC; Chemical: 27 - hydroxycholesterol; Chemical: 27OHC