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Hamada T, Sugawara T, Matsunaga S, Fusetani N. (1994). Polytheonamides A-C, highly cytotoxic polypeptides from the marine sponge Theonella swinhoei. In: Van Soest RWM, van Kempen TMG, Braekman JC (eds) Sponges in Time and Space. Biology, Chemistry, Paleontology. Balkema, Rotterdam, pp 453-457.