21106
The cysteines required for desensitization are not accessible to all electrophiles as iodoacetamide and internally applied 2 - ( trimethylammonium ) ethyl methanesulfonate failed to cause desensitization ( despite large activation ) .
 Chemical: cysteines; Chemical: iodoacetamide; Chemical: 2 - ( trimethylammonium ) ethyl methanesulfonate
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: cysteines; Chemical: iodoacetamide; Chemical: 2 - ( trimethylammonium ) ethyl methanesulfonate