A unique neovibsane-type diterpene, neovibsanin C (1), isolated from the leaves of Viburnum awabuki, has been demonstrated to have an unprecedented structure macrocyclized via an endo-peroxide by extensive analyses of spectral data and chemical degradation as well as synthesis of I from neovibsanin B (3).
Kubo, M., Minami, H., Hayashi, E., Kodama, M., Kawazu, K., & Fukuyama, Y. (1999). Neovibsanin C, a macrocyclic peroxide-containing neovibsane-type diterpene from Viburnum awabuki. Tetrahedron Letters, 40(34), 6261–6265. https://doi.org/10.1016/S0040-4039(99)01199-5