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The use of general descriptive names, trademarks, etc., in this publication, even if the former are not especially identified, is not to be taken as a sign that such names, as understood by the Trade Marks and Merchandise Marks Act, may accordingly be used freely by anyone.

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Sheffield S3 7HFThe root material of Derris scandens collected from two localities in India has yielded five natural products whose structures have been examined mainly by physical methods in association with a few partial syntheses and degradations. The extractives include the isoflavones, warangalone (scandenone) ( V I I a ) and chandalone ( X I V ) . and three 3-aryl-4-hydroxycoumarins, lonchocarpicacid (II),scandenin (111), and lonchocarpenin (X). The results of the examination of these extractives are compared with earlier studies and the biogenetic significance of the natural co-occurrence of isoflavones and 3-aryl-4-hydroxycoumarins is discussed.THE recognition of 3-aryl-4-hydroxycoumarins as a further structural variant among the isoflavonoid group of natural products encouraged us to consider the interpretation of previously published work on the constitution of lonchocarpic acid 4-6 and scandenin.6-ll These two natural products had already been investigated in some detail, but although structural proposals were not made, the general features of their constitutions could be recognised on the evidence already available. Thus, the close similarity between the chemical behaviour of lonchocarpic acid, scandenin, and robustic acid had already been emphasised and this had formed the basis of the view 6~12 that these substances were members of the same general class of natural phenolic compounds. At that time, it seemed probable that robustic acid, loncliocarpic acid, and scandenin belonged Part I, A. J. East, W. D. Ollis, and R. E. Whccler, preceding paper.W. D. Ollis, ' The Chemistry of Flavonoid Compounds,' ed.