22568
We report the isolation and structure elucidation of a new cheilanthane sesterterpene from the roots of Aletris farinosa that possesses an unusual malonate half - ester functional group .
 Chemical: cheilanthane; Chemical: sesterterpene; Chemical: malonate half - ester
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: cheilanthane; Chemical: sesterterpene; Chemical: malonate half - ester