Abstract
The root bark of Ventilago viminalis Hook.
contains three new colouring matters now named ventimalin, viminalin, and
ventilagone. The first of these has been identified as
1,3,4,5,6-pentahydroxy-2-methylanthraquinone and the structure has been confirmed
by synthesis. Viminalin is shown to be the 4,5-dimethyl ether of ventimalin.
Ventilagone is apparently a naphthoquinone of the hydroxy- juglone type. Two
known anthraquinones, chrysophanol and islandicin, have also been isolated and
there is evidence for the presence of helminthosporin.
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