1447
Via the sequential isolation of Pueraria thunbergiana , the active component was ultimately identified as daidzein ( 4 ' , 7 - dihydroxy - isoflavone ) .
 Chemical: daidzein; Chemical: 4 ' , 7 - dihydroxy - isoflavone
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: daidzein; Chemical: 4 ' , 7 - dihydroxy - isoflavone