potassium 2,3,4-trihydroxy-4-oxobutanoate potassium 2,3,4-trihydroxy-4-oxo-butanoate potassium 2,3,4-trihydroxy-4-keto-butyrate LS-2397 NSC155080 potassium; 2,3-dihydroxybutanedioate; hydron potassium; 2,3-dihydroxysuccinate; hydron