18427
Three essential oils from three samples : stems , leaves and inflorescences of Thymus maroccanus Ball , obtained by hydrodistillation , were analysed by gas chromatography and gas chromatography coupled to mass spectrometry .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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