636
The essential oil from air dried buds and roots of Calligonum polygonoides Linn . , has been extracted from dry steam distillation and analysed for chemical composition by gas chromatography - 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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