28143
This review article is an effort to summarize medicinal chemistry investigations over the last decade , in search for new N - bridged heterocycles which can be a rich source of promising biological activities .
 Chemical: N
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: N