Pithecellobium lobatum

Lee, M. et al.. Tannins and related compounds. III. Flavan-3-ol gallates and proanthocyanidins from Pithecellobium lobatum. Phytochemistry, 31, 2117, 1992. 

C7HJ4N2O4S2, Mr 254.32, mp. 300-350°C (decomp.), [o]d -65.0° (1 m HCl) monohydrochloride, mp. 300 - 350 °C (decomp.). Non proteinogenic amino acid from Pithecellobium lobatum and other Fabaceae it occurs in P. bubalium (4%) and many species of Acacia, A(-Acetyldjenkolic acid is found in Mimosa acan-thocarpa. When taken orally D. can form crystals in the kidneys and cause severe pain. For its action on the nervous system, see Lit.. The synthesis proceeds from L-Cys and formaldehyde in strongly acidic solution. Ut. J. Neurosci. 14, 3881-3897 (1994). gen. Beilstein EIII 4, 1591 Karrer, No. 2423 Phytochemistry 23, 265-270 (1984). - [HS 293090 CAS 498-59-9]... 

The sulfiir-containing amino acid, djenkolic acid (82), is found in seeds of many species of Pithecellobium, Acacia, and Mimosa (Fig. 13.16). This compound produces human toxicity in Java when the seeds of P. lobatum are eaten. Related sulfiir-containing amino acids are found in these and other mimosoid legumes. 

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