8457
( 99m ) Tc ( CO ) ( 3 ) - 3d bound specifically to CA - IX expressing hypoxic HeLa cells .
 ( 99m ) Tc ( CO ) ( 3 )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 ( 99m ) Tc ( CO ) ( 3 )