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Antioxidant activity comparison between [ 6S ] - 5 - methyltetrahydrofolic acid calcium salt and the related racemate form .
 Chemical: [ 6S ] - 5 - methyltetrahydrofolic acid calcium
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: [ 6S ] - 5 - methyltetrahydrofolic acid calcium