Abstract
The 35% EtOH extract of aerial parts of Impatiens balsamina L. has been investigated for activity against testosterone 5alpha-reductase. Activity-guided fractionation led to the identification of the bisnaphthquione derivative named impatienol (1), 3-hydroxy-2-¿[3-hydroxy-1,4-dioxo (2-naphthyl)] ethyl¿ naphthalene-1, 4-dione, which exhibited significant testosterone 5alpha-reductase inhibitory activity. This 5alpha-reductase inhibitory compound has been previously synthesized, but this is the first report of its isolation from a natural source.
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