16043
Structural analogs of huperzine A improve survival in guinea pigs exposed to soman .
 Chemical: huperzine A
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: huperzine A 
Answer:
 Chemical: huperzine A