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We have explored the structure / function relationships in the reactivity between several yeast and human AKRs and various diketones and acetoin .
 Chemical: diketones; Chemical: acetoin
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: diketones, acetoin 
Answer:
 Chemical: diketones; Chemical: acetoin