2117
In addition , AChE inhibited by an analogue of tabun ( i . e . , O - ethyl isopropylphosphonofluoridate ) was nearly as resistant to reactivation as tabun - inhibited AChE .
 tabun, O - ethyl isopropylphosphonofluoridate, tabun
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 tabun, O - ethyl isopropylphosphonofluoridate, tabun