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