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Schmitz, F. J., et al. 1991. Cytotoxic Aromatic Alkaloids From the Ascidian Amphicarpa meridiana and Leptoclinides sp.: Meridine and 11-hydroxyascididemin. J Org Chem, 56: 804-808.
McDonald, L. A., et al . 1994. Inhibition of Topoisomerase II Catalytic Activity by Pyridoacridine Alkaloids From a Cystodytes sp. ascidian: A Mechanism for the Apparent Intercalator-Induced Inhibition of Topoisomerase II. J Med Chem, 37: 3819-3827.