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Hop extract is a long used medicinal product and , regarding hormonal activities , in 1999 a number of prenylflavanones have been identified as its major constituents with 8 - prenylnaringenin ( 8 - PN ) being the main active estrogenic compound .
 Chemical: prenylflavanones; Chemical: 8 - prenylnaringenin; Chemical: 8 - PN
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: prenylflavanones; Chemical: 8 - prenylnaringenin; Chemical: 8 - PN