A new pregnane analogue from Hainan soft coral Scleronephthya gracillimum Kükenthal

[Han, Lei; Wang, Chang-Yun; Shao, Chang-Lun; Liu, Qing-Ai; Qi, Jun; Sun, Xue-Ping; Zhai, Peng] Ocean Univ China, Key Lab Marine Drugs, Minist Educ, Sch Med & Pharm, Qingdao 266003, Peoples R China; [Huang, Hui] Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou 510000, Guangdong, Peoples R China; [Gu, Yu-Cheng] Syngenta, Jealotts Hill Int Res Ctr, Bracknell RG42 6EY, Berks, England