Journal of Natural Products
Antineoplastic agents, 178. Isolation and structure of lychnostatins 1 and 2 from the South American Lychnophora antillana.
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Bioassay-guided (P388 lymphocytic leukemia cell line) separation of a CH2Cl2/MeOH extract of Lychnophora antillana led to the isolation of two cytostatic (P-388, ED50 2.0 and 0.19 micrograms/ml, respectively) germacranolides designated lychnostatins 1 [1] and 2 [2]. Structural elucidation was based initially upon high field (400 MHz) nmr and electron impact mass spectral interpretations and unequivocally completed by X-ray crystal structure determinations.