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The gamma - butenolide structural motif is a prominent feature in many bioactive natural products and drugs .
 Chemical: gamma - butenolide
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: gamma - butenolide 
Answer:
 Chemical: gamma - butenolide