↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
↑ Constanze Knappwost: The pronounced selectivity of cyclohexadienone spirobutenolids under high pressure conditions , dissertation, 2000, p. 3. DNB 961697121/34
^ Richard P. Gregson, David Ouvrier: Wistarin, A Tetracyclic Furanosesterterpene From the Marine Sponge Ircinia wistarii. In: Journal of Natural Products . 45, 1982, pp. 412-414, doi : 10.1021 / np50022a008 .
↑ Mahmud Tareq Hassan Khan (eds.), MJ Carlucci, H. Cerecetto, EB Damonte, O. Demirkiran: Bioactive Heterocycles V. Springer, Berlin / Heidelberg / New York 2007, pp. 242-243, ISBN 978-3-540 -73405-5 .