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. ^ however, perkin claimed (without citing a source) that chevreul had isolated luteolin as early as – . see: perkin, arthur george; everest, arthur ernest ( ). the natural organic colouring matters . london, england: longmans, green and co. p. . ^ hlasiwetz, h.; pfaundler, l. ( ).
(luteolin thus seems to be able to be regarded perhaps as an isomer or metamer of our substance [viz, paradatiscetin]. however, the two are evidently not identical, for upon a test of luteolin, we did not find the characteristic color reactions, which hardly allows paradatiscetin to be confused [with...
https://en.wikipedia.org/wiki/Luteolin