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Cyclo - ( His , Leu ) : a new microbial diketopiperazine from a terrestrial Bacillus subtilis strain B38 .
 Chemical: Cyclo - ( His , Leu ); Chemical: diketopiperazine
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: Cyclo - ( His , Leu ); Chemical: diketopiperazine