4232
In this study , a comparison between [ 6S ] - 5 - methyltetrahydrofolic acid ( 5 - MTHF ) and its racemate [ 6R , S ] form was made by TEAC assay at different pHs , FRAP assay , and ORAC assay .
 Chemical: [ 6S ] - 5 - methyltetrahydrofolic acid; Chemical: 5 - MTHF
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; Chemical: 5 - MTHF