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Guided by co - crystal structures of compounds 15 , 22 and 30 , an SBDD approach led to the discovery of the 6 - methyl pyridone series as a novel class of GKAs that potently activate GK in enzyme and cell assays .
 Chemical: 6 - methyl pyridone
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: 6 - methyl pyridone