8408
Novel betulinic acid derivative 5 ' - chloro - 2 , 3 - didehydroindolo [ 2 ' , 3 ' : 2 , 3 ] betulinic acid ( DRF - 4012 ) is a new effective lupane type triterpenes with greater anticancer activity and efficacy than betulinic acid and currently under advanced preclinical investigation phase .
 Chemical: betulinic acid; Chemical: 5 ' - chloro - 2 , 3 - didehydroindolo [ 2 ' , 3 ' : 2 , 3 ] betulinic acid; Chemical: DRF - 4012; Chemical: lupane; Chemical: triterpenes; Chemical: betulinic acid
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: betulinic acid; Chemical: 5 ' - chloro - 2 , 3 - didehydroindolo [ 2 ' , 3 ' : 2 , 3 ] betulinic acid; Chemical: DRF - 4012; Chemical: lupane; Chemical: triterpenes; Chemical: betulinic acid