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R , R - Monatin [ 2R , 4R - isomer of 2 - hydroxy - 2 - ( indol - 3 - ylmethyl ) - 4 - aminoglutaric acid ] is one of four natural constituent isomers in the root bark of Sclerochitin ilicifolius ; and " arruva " is the common / usual name that is proposed to represent R , R - monatin salt forms , which have potential use as high potency sweetener food ingredients .
 Chemical: R , R - Monatin; Chemical: 2R , 4R - isomer of 2 - hydroxy - 2 - ( indol - 3 - ylmethyl ) - 4 - aminoglutaric acid; Chemical: arruva; Chemical: R , R - monatin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: R , R - Monatin; Chemical: 2R , 4R - isomer of 2 - hydroxy - 2 - ( indol - 3 - ylmethyl ) - 4 - aminoglutaric acid; Chemical: arruva; Chemical: R , R - monatin