8131
Also provided is a detailed account of the development of a multigram scale synthesis of the diazatricyclic ring system , which was achieved using a Hofmann - L o ffler - Freytag reaction as the key step .
 Chemical: diazatricyclic
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: diazatricyclic