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Sata, N.U.; Wada, S.; Matsunaga, S.; Watabe, S.; Van Soest, R.W.M.; Fustenia, N. (1999). Rubrosides A-H, New Bioactive Tetramic Acid Glycosides from the marine sponge Siliquariaspongia japonica. Journal of Organiic Chemistry. 64: 2331-2339.