5405
Podophyllum species are sources of ( - ) - podophyllotoxin , an aryltetralin lignan used for semi - synthesis of various powerful and extensively employed cancer - treating drugs .
 Chemical: ( - ) - podophyllotoxin; Chemical: aryltetralin lignan
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: ( - ) - podophyllotoxin; Chemical: aryltetralin lignan