16047
In this manuscript , the tested huperzine A analogs 2 and 3 were demonstrated to improve survival of guinea pigs exposed to soman at either 1 . 2 or 2 x LD ( 50 ) .
 huperzine A
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 huperzine A