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A novel natural sesquiterpene-dimer-type compound, named parviflorene A (1), was isolated from the extract of a tropical Zingiberaceous plant, Curcuma parviflora, collected in Thailand, and its structure was elucidated by spectral data. Parviflorene A (1) possesses an unprecedented unsymmetrical bis-cadinane skeleton and exhibited cytotoxic activity against murine leukemia P388 and B16 melanoma cells.
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