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Furthermore , the structure of 6 - desacetylnimbin was confirmed by X - ray crystallography .
 Chemical: 6 - desacetylnimbin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: 6 - desacetylnimbin