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Zea, S.; Parra, F.J.; MartÃnez, A.; Duque, C. (1999). Production of bioactive furanosesterpene tetronic acids as possible internal chemical defense mechanism in the sponge Ircinia felix (Porifera: Demospongiae). In: Hooper JNA (ed) Origin and Outlook. Proceedings of the 5th International Sponge Symposium 1998. Memoirs of the Queensland Museum. 44: 687-696.