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A preliminary clinical investigation with the CYP3A4 / 5 substrate probe alfentanil established that ticlopidine did not inhibit intestinal or hepatic CYP3A4 / 5 .
 Chemical: alfentanil; Chemical: ticlopidine
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: alfentanil; Chemical: ticlopidine