7331
Photoinitiators used in food packaging ink , such as 2 - isopropylthioxanthone ( 2 - ITX ) , have been shown to migrate into food and beverages .
 2 - isopropylthioxanthone, 2 - ITX
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 2 - isopropylthioxanthone, 2 - ITX