13650
Abamectin , fipronil , and pyrethroids ( mainly cypermethrin ) were identified as the principal contributors to the noted toxicity in the midges , with median predicted toxic units of 1 . 63 , 1 . 63 , and 1 . 03 , respectively .
 Chemical: Abamectin; Chemical: fipronil; Chemical: pyrethroids; Chemical: cypermethrin
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: Abamectin; Chemical: fipronil; Chemical: pyrethroids; Chemical: cypermethrin