25423
The purities of the two compounds were 97 . 97 +/- 0 . 90 % and 95 . 50 +/- 0 . 75 % , respectively , as determined by high performance liquid chromatography ( HPLC ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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