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Spongenolactones A–C, Bioactive 5,5,6,6,5-Pentacyclic Spongian Diterpenes from the Red Sea Sponge Spongia sp.
- Chi-Jen Tai,
- Atallah F. Ahmed,
- Chih-Hua Chao,
- Chia-Hung Yen,
- Tsong-Long Hwang,
- Fang-Rong Chang,
- Yusheng M. Huang and
- Jyh-Horng Sheu
Three new 5,5,6,6,5-pentacyclic spongian diterpenes, spongenolactones A–C (1–3), were isolated from a Red Sea sponge Spongia sp. The structures of the new metabolites were elucidated by extensive spectroscopic analysis and the absolute co...