21780
Based on this method , the seasonal variations and extraction characteristics , in terms of total extraction yield and the content of the phlorotannins , were investigated under various extraction conditions .
 Chemical: phlorotannins
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: phlorotannins