6440
Urine samples were submitted to enzymatic hydrolysis of glucuconjugated metabolites followed by liquid - liquid extraction and analysis of the trimethylsilyl derivatives by gas chromatography coupled to tandem mass spectrometry .
 Chemical: trimethylsilyl
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: trimethylsilyl