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Antagonism of diazepam - induced effects by Ro15 - 1788 was investigated postoperatively in a double - blind placebo - controlled trial .
 Chemical: diazepam; Chemical: Ro15 - 1788
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: diazepam; Chemical: Ro15 - 1788