16657
Overall , IR3535 ( (R) ) and IR3535 ( (R) ) - free acid excreted with urine over 48 h representing 13 . 3 +/- 3 . 05 % of the dose applied .
 IR3535, IR3535
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 IR3535, IR3535