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S. Peixinho | Jaime Rodríguez | C. Jiménez | L. Núñez
[1] E. Fattorusso,et al. Steroids of the Marine Sponge Cinachyra tarentina: Isolation of Cholest-4-ene-3,6-dione and (24R)-24-Ethylcholest-4-ene-3,6-dione , 1991 .
[2] C. Djerassi,et al. Steroids from sponges , 1974 .