| http://www.w3.org/ns/prov#value | - A process of producing monatin represented by the following formula (7???) or a salt thereof, including a step of reacting 4-hydroxy-4-(3-indolylmethy)-2-ketoglutaric acid represented by the following formula (4???) or a salt thereof with an amine compound represented by the following formula (5) or a salt thereof, to obtain a glutaric acid compound represented by the following formula (6???) or a
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