8407
Application of a liquid chromatography - electrospray mass spectrometry ( LC / MS ) method to the biodistribution and excretion studies of novel 5 ' - chloro - 2 , 3 - didehydroindolo ( 2 ' , 3 ' : 2 , 3 ) betulinic acid ( DRF - 4012 ) in tumour - bearing mice .
 Chemical: 5 ' - chloro - 2 , 3 - didehydroindolo ( 2 ' , 3 ' : 2 , 3 ) betulinic acid; Chemical: DRF - 4012
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: 5 ' - chloro - 2 , 3 - didehydroindolo ( 2 ' , 3 ' : 2 , 3 ) betulinic acid; Chemical: DRF - 4012