Composition #1: Jakupovic, J., Boeker, R., Grenz, M., Paredes, L., Bohlmann, F., El-Din, A. Seif. Highly oxygenated guaianolides from Otanthus maritimus.. Phytochemistry, 1988, vol. 27, no. 4, p. 1135–40. DOI: 10.1016/0031-9422(88)80289-9.
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