Shigeo Nozoe, Masuo Morisaki, Kyosuke Tsuda, Yoichi Iitaka, Nobutaka Takahashi, Saburo Tamura, Keijiro Ishibashi, Makoto Shirasaka,
The Structure of Ophiobolin, a C25Terpenoid Having a Novel Skeleton Journal of the American Chemical Society. ,vol. 87, pp. 4968- 4970 ,(1965) ,
10.1021/JA00949A061