Cyclic peptides from higher plants, Part 15. Pseudostellarin H, a new cyclic octapeptide from Pseudostellaria heterophylla.

A new cyclic octapeptide, pseudostellarin H [1], was isolated from the roots of Pseudostellaria heterophylla. Based on spectral evidence and chemical degradation, the primary structure of 1 was established as cyclo(Gly-Thr-Pro-Thr-Pro-Leu-Phe-Phe).