Five new cytotoxic cembrenolides, kericembrenolies A (7__∼), B (8__∼), C(9__∼), D (10__∼), and E (11__∼), having an α-methylene-γ-lactone moiety were isolated together with neodolabelline (5__∼) and neodolabellenol (6__∼) from the Okinawan soft coral Clavularia koellikeri. Their absolute configurations were determined on the basis of chemical and physicochemical evidence.
五种新的具有细胞毒性的仙人掌内酯,即角叉菜内酯 A (7__∼)、B (8__∼)、C (9__∼)、D (10__∼) 和 E (11__∼)、从冲绳软珊瑚 Clavularia koellikeri 中分离出了具有 α-亚甲基-γ-内酯分子的 Neodolabelline(5__∼)和 neodolabellenol(6__∼)。根据化学和物理化学证据确定了它们的绝对构型。