D'Auria, Maria Valeria Crellastatin A: A Cytotoxic Bis-Steroid Sulfate from the Vanuatu Marine Sponge Crella sp. [electronic resource] - The Journal of organic chemistry Oct 1998 - 7382-7388 p. digital Publication Type: Journal Article ISSN: 1520-6904 Standard No.: 10.1021/jo981022v doi