K 1235 (OTTO) α-Ketoglutaric acid, 99%+ Cas 328-50-7 - used as an intermediate in the kreb's cycle catalyzed by glutamate dehydrogenase enzyme on glutamate. K 1235 (OTTO) α-Ketoglutaric acid, 99%+ Cas 328-50-7 - used in dietary supplements to improve protein synthesis.