21149
The natural flavonoid quercetin has been shown to counteract the development of glyceryl trinitrate tolerance in vitro .
 Chemical: quercetin; Chemical: glyceryl trinitrate
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: quercetin; Chemical: glyceryl trinitrate