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).