| http://www.w3.org/ns/prov#value | - A process of producing 4-hydroxy-4-(3-indolylmethyl)-2-ketoglutaric acid represented by the following formula (4???) or a salt thereof, including a step of treating indole-3-pyruvic acid represented by the following formula (1???) and oxalacetic acid represented by the following formula (2) by cross aldol reaction and decarboxylation reaction, or treating indole-3-pyruvic acid represented by the f
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