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    • Seldes, A. M.; Gros, E. G.; Suarez, A.; Rovirosa, Juana; San Martín Barrientos, Aurelio (1988)
      The sponge Esperiopsis edwardii was examined for its steroids. It contains forty-three C27-C29 derivatives with four different types of nucleus: 3 β-hydroxy-Δ5-; 3β-hydroxy-5αH-; 3α-hydroxy-5α H- and 3-keto-Δ4-derivatives. ...