The liverwort Riella helicophylla was cultivated in vitro under aseptic conditions. The lipophilic extract of the plant material yielded seventeen monoterpenes and eleven diterpenes. Seven monoterpenes were hydroperoxides. From the diterpenes six belonged to the labdane type skeleton and one to the kaurane type, the other diterpenes were phytane derivatives.
Omphalotins B, C and D, Nematicidal Cyclopeptides from Omphalotus olearius. Absolute Configuration of Omphalotin A. -The structures of the new omphalotins B, C, and D, which possess similar nematicidal activity as omphalotin A, are determined by spectroscopic means. All amino acids in omphalotin A have L configuration. -(BUECHEL, E.; MARTINI, U.; MAYER, A.; ANKE, H.; STERNER, O.; Tetrahedron 54 (1998) 20, 5345-5352; Div. Org. Chem. 2, Chem. Cent., Lund Inst. Technol., Lund Univ., S-221 00 Lund, Swed.; EN)
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