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For the experiments described in this paper , essential oils were obtained from kumquat peels or whole fruit by cold pressing , steam distillation or heating in water at 90 degrees C for 15 min followed by steam distillation .
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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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