22105
The most active were 7 - iodo and 7 - ethynyl derivatives .
 Chemical: 7 - iodo; Chemical: 7 - ethynyl
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: 7 - iodo; Chemical: 7 - ethynyl