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In an open , cross - over , controlled design , patients were randomized to receive either DCF per os or GTN patches the first days of menses , when menstrual cramps became unendurable .
 Chemical: DCF; Chemical: GTN
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: DCF; Chemical: GTN