13466
Nerve agents such as tabun , cyclosarin and Russian VX inhibit the essential enzyme acetylcholinesterase ( AChE ) by organophosphorylating the catalytic serine residue .
 Chemical: tabun; Chemical: cyclosarin; Chemical: Russian VX; Chemical: serine
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: tabun; Chemical: cyclosarin; Chemical: Russian VX; Chemical: serine