21655
The structure elucidation and the assignment of the relative configurations of the isolated natural products were based on extensive analyses of their spectroscopic data , whereas the absolute configuration of metabolite 2 was determined through its chemical conversion to a previously isolated compound of known configuration .
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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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