thus , alpha-keto-gamma- ( beta-hydroxyethiol ) butyric acid ( s- ( hydroxyethyl ) -2-keto-4-mercaptobutyric acid ) was obtained when l-methionine sulfoximine was oxidized in the presence of 2-mercaptoethanol , and enzymatic transamination of this alpha-keto acid with l-glutamine gave the new amino acid , l-omega-hydroxyethionine .
C0017797
l-glutamine
C0002520
amino acid