11789
Exposure to 19 - epi - OKA resulted also in less toxicity for cultured glial cells ( EC5024 , 19 - epi - OKA ~ 600nM ; EC5024 , OKA ~ 20nM ) .
 Chemical: 19 - epi - OKA; Chemical: 19 - epi - OKA; Chemical: OKA
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: 19 - epi - OKA; Chemical: 19 - epi - OKA; Chemical: OKA