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The volatile constituents of the rare species of Hypericum , namely Hypericum pruinatum ( as one population ) and Hypericum aviculariifolium subp . depilatum var . depilatum ( endemic , as two populations namely ' G u m u s ' and ' Yenik o y ' ) growing wild in the mountainous parts of Northern Turkey were studied for the first time .
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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:
 None