Hyrtiosins A and B, new indole alkaloids from the Okinawan marine sponge Hyrtios erecta
β Scribed by Jun'ichi Kobayashi; Tetsuya Murayama; Masami Ishibashi; Sumiko Kosuge; Masako Takamatsu; Yasushi Ohizumi; Hiroshi Kobayashi; Tomihisa Ohta; Shigeo Nozoe; Sasaki Takuma
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- French
- Weight
- 342 KB
- Volume
- 46
- Category
- Article
- ISSN
- 0040-4020
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## Abstract Five new scalarane sesterterpenes, hyrtiosins AβE (**1**β**5**), together with three previously reported sesterterpenes, 25βdehydroxyβ12β__epi__βscalarin (**6**), 12β__epi__βscalarin (**7**) and heteronemin (**9**), were isolated from the South China Sea sponge __Hyrtios erecta.__ Their
## Abstract The title compounds are the first natural products possessing a furopyrazine moiety.
Keramamine-A and -B, two new B-carboline alkaloids with a 13 membered ring have been isolated from the Okinawan marine sponge Pellina sp. as antimicrobial substances and the structures of keramamine-A and -B have been determined by X-ray analysis and by spectral and chemical means, respectively. As