2036
PURPOSE : Previous WR - 2721 human pharmacokinetic studies were limited to plasma levels in patients receiving platinum - based compounds , and none includes the effects of WR - 2721 on endogenous thiols .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None