7563
Moreover , VK2 - 2 , 3 epoxide , an intracellular metabolite of VK2 , was shown to covalently bind to the cysteine - 166 residue of Bak .
 Chemical: VK2 - 2 , 3 epoxide; Chemical: VK2; Chemical: cysteine
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: VK2 - 2 , 3 epoxide; Chemical: VK2; Chemical: cysteine