3-(3_Carboxyphenyl)alanine, (3-carboxyphenyl)glycine, 3-(3-carboxy-4-hydroxyphenyl)alanine and (3 carboxy-4-hydroxyphenyl)glycine occur in all parts of Resedu Zuteola. The concentrations of the two diastereoisomers of 2(S)-4-hydroxy-4-methylglutamic acid undergo seasonal variation, the highest concentrations occurring in the first part of the summer. Highest concentrations are found in the inflorescences. The two diastereoisomers of 2(s)-4 hydroxy-2-aminopimelic acid occur in appreciable amounts in all parts of the plant. They are easily transformed into two structurally different lactones, one of which is very unstable. The structures of these amino acids have been confirmed by synthesis. Green parts of R. luteoh also contain substantial quantities of y-glutamylglutamic acid and glutathione.