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Role of carbonyl reducing enzymes in the phase I biotransformation of the non - steroidal anti - inflammatory drug nabumetone in vitro .
 Chemical: carbonyl; Chemical: nabumetone
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: carbonyl; Chemical: nabumetone