Chemical constituents from the South China sea soft coral .

A new diterpenoid with an unusual capnosane skeleton, sinuhumilol A (), alone with twelve known diverse compounds (), were isolated from the South China Sea soft coral Their structures and stereochemistry were elucidated by extensive spectroscopic analysis, quantum chemical calculations, and/or by the comparison of the spectroscopic data with those reported in the literature. In bioassay, compound exhibited interesting specific cytotoxicity against the human colon adenocarcinoma cell line HT-29 with IC value of 12.5 M.