MASS SPECTROMETRIC STUDIES ON ALKANNINS
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Abstract
This paper reports the mass spectrometrical fragmentations and the characteristics of alkannin compounds. The complete structure of a new compound, O-β-acetoxyisovalerylshikonin (5), isolated from Macrotomia euchroma (Royle) Pauls is proposed solely by the mass spectra and confirmed by NMR data.
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