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Astaxanthin ( C40H52O4 ) is an important natural pigment that has considerable promising applications in human health .
 Chemical: Astaxanthin; Chemical: C40H52O4
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: Astaxanthin; Chemical: C40H52O4