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In this tutorial review we discuss the range of commonly used dienophiles and aza - dienes for this process whilst highlighting the reactivity trends , and illustrating their applications .
 Chemical: aza - dienes
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: aza - dienes