18001
All of these active compounds possess C ( 19 ) - O - acyl group , and among which , ent - kaur - 16 - ene - 13 , 19 - diol 19 - O - 4 ' , 4 ' , 4 ' - trifluorocrotonate ( 14 ) exhibited potent cytotoxicities against four cell lines with IC ( 50 ) values in the range of 1 . 2 - 4 . 1 mu M .
 Chemical: O - acyl; Chemical: ent - kaur - 16 - ene - 13 , 19 - diol 19 - O - 4 ' , 4 ' , 4 ' - trifluorocrotonate
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: O - acyl; Chemical: ent - kaur - 16 - ene - 13 , 19 - diol 19 - O - 4 ' , 4 ' , 4 ' - trifluorocrotonate