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A new eusdesmane sesquiterpenoid, characterised as 5-acetoxy-9a β -hydroxy-4aαH-3,5α, 8a β -trimethyl-4, 4a, 6, 7, 8a, 9-hexahydronaphtho-([2, 3 b]-dihydrofuran-2-one)-8-one or phaeusmane F acetate ( 1 ) has been isolated from the rhizomes of the South African variety of wild ginger ( iphonochilus aethiopicus  (Schweinf) B.L. Burtt). The compound was obtained after a series of column and gel filtration chromatography. Its structure was elucidated by NMR and Mass-Spectrometric analyses, including 1 D-, 2 D-NMR and HR-LCMS. This is an initial report of the compound from a  Siphonochilus sp . Previously isolated similar compounds from the plant material were 4aαH-3,5α,8a β -trimethyl-4,4a,8a,9-tetrahydronaphtho[2,3b]-furan-8-one (siphonochilone) ( 2 ), 9a β -hydroxy-4aαH-3,5α,8a β -trimethyl-4,4a,8a,9-tetrahydronaphtho-([2,3b]-dihydrofuran-2-one)-8-one ( 3 ), 4aαH-3,5α,8a β -trimethyl-4,4a,8a,9-tetrahydronaphtho-([2,3b]-dihydrofuran-2-one)-8-one ( 4 ), 2-hydroxy-4aαH-3,5α,8a β -trimethyl-4,4a,8a,9-tetrahydro-naphtho[2,3b]- furan-8(5H)-one ( 5 ), 4aαH-3,5α,8a β -trimethyl-4,4a,8a-trihydronaphtho-([2,3b]-dihydrofuran-2-one)-8-one ( 6 ).

A new sesquiterpene from South African wild ginger ( Siphonochilus aethiopicus (Schweinf) B.L. Burtt)