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The study also aimed at providing a scientific rationale for the traditional use of plant combinations to treat skin diseases and the isolation of the bioactive compound from the most active species , Aristea ecklonii ( Iridaceae ) .
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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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