25869
The extract was applied topically , 30min before each UVB exposure , in a dose of 4mg total polyphenols / cm ( 2 ) .
 Chemical: polyphenols
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: polyphenols