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When rats were concomitantly treated with GLT and warfarin , the prolongation of clotting time of blood by warfarin was not influenced .
 Chemical: warfarin; Chemical: warfarin
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: warfarin; Chemical: warfarin