Cytotoxic 9,11-secosteroids from the South China Sea gorgonian Subergorgia suberosa

- Ten new 9,11-secosteroids were isolated from the gorgonian Subergorgia suberosa.
- Their structures were elucidated by analysis of MS, 1D and 2D NMR data.
- All the isolates possess the same 3β,6α,11-trihydroxy-7-en-9-one-5α-9,11- secosteroidal nucleus.
- Compounds 9 and 10 showed significant cytotoxic activities..