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O - heterocyclic embeurekols from Embellisia eureka , an endophyte of Cladanthus arabicus .
 Chemical: O - heterocyclic embeurekols
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: O - heterocyclic embeurekols