Two new sesterterpene tetronic acids from the marine sponge Ircinia oros

@article{Hller1997TwoNS,
  title={Two new sesterterpene tetronic acids from the marine sponge Ircinia oros},
  author={U. H{\"o}ller and G. K{\"o}nig and A. Wright},
  journal={Journal of Natural Products},
  year={1997},
  volume={60},
  pages={832-835}
}
Two new sesterterpene tetronic acids, (8Z,13Z,18S,20Z)-strobilinin (1) and (7E,12Z,18S,20Z)-variabilin (3), together with the known compounds (7E,12E,18S,20Z)-variabilin (5), (7E,13Z,-18S,20Z)-variabilin (7), and (7Z,12Z,20Z)-variabilin (9), have been isolated from the sponge Ircinia oros as their 22-O-methyl derivatives 2, 4, 6, 8, and 10. The structures of all compounds were determined by spectroscopic methods, mainly 1D and 2D NMR methodologies. 
19 Citations
Chemical Constituents of the Vietnamese Marine Sponge Gelliodes sp. and Their Cytotoxic Activities
Variabilin, a Chemotaxonomic Marker for the Family Irciniidae
Terpenoids from Marine Organisms: Unique Structures and their Pharmacological Potential
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