8647
In many respects tetrodotoxin ( TTX ) is the quintessential natural toxin .
 Chemical: tetrodotoxin; Chemical: TTX
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: tetrodotoxin; Chemical: TTX