27949
Compound 2 , characterized by the presence of a formed C - 16 / C - 26 ester bridge , provided a novel nine - membered lactone ring structural skeleton for 3 , 4 - secocycloartane triterpenoid derivatives .
 Chemical: ester; Chemical: lactone; Chemical: 3 , 4 - secocycloartane
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: ester, lactone, 3 , 4 - secocycloartane 
Answer:
 Chemical: ester; Chemical: lactone; Chemical: 3 , 4 - secocycloartane