6450
As a large number of experimental and theoretical studies have shown that the quinoline ring system is an important structural unit widely existing in alkaloids , therapeutics and synthetic analogues with exciting biological activities .
 Chemical: quinoline
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: quinoline