From Tanacetum vulgare

Larocque N, Vincent C, Belanger A, Bourassa J-P (1999) Effects of tansy essential oil from Tanacetum vulgare on biology of oblique-banded leafroller, Chorisoneura rosaceana. J Chem Ecol 25 1319-1330... 

Cell-free extracts and acetone powder preparations from Agave amerkana have been shown to phosphorylate mevalonic acid to give phosphomevalonic acid and thence pyrophosphomevalonic acid at an optimum pH of 7.0. Glutathione and mercaptoethanol enhance the activity of these preparations. Tracer studies with tissue cultures derived from Tanacetum vulgare have revealed the formation of phosphomevalonic acid, pyrophosphomevalonic acid, isopentenyl pyrophosphate, dimethylallyl pyrophosphate, and the incorporation of mevalonic acid into monoterpenes. However, the mono-terpene components of the tissue culture differed from those of the whole plant, sabinene being formed rather than isothujone. 

The essential oils of Artemisia absinthium and Tanacetum vulgare (Asteraceae) were obtained from whole cultivated plants harvested in full... 

Croteau, R. and Felton, N.M. (1980) Substrate specificity of monoterpenol dehydrogenases from Foeniculum vulgare and Tanacetum vulgare. Phytochemistry 1 9(7), 1 343-1 347. 

At least ten chemical taxa of Tanacetum vulgare have been revealed by analysis of the leaf monoterpenoids.449,450 These breed true from individual plants over up to 7 years, and, of the two most common monoterpenoid types, that producing camphor was shown to be dominant over that producing thujone by crossing experiments. Four taxa were similarly identified for Lindera species,451 and the occurrence of such races in many species and genera would probably be revealed by analysis of large numbers of individual plants rather than of oil obtained from pooled populations. 

Oil of Tansy. Volatile oil from leaves and tops of Tanacetum vulgare L, Compositae. Constit. Thujone, bor-neol camphor. 

Tanacetin. Decahydro-6i3,9aa-dihydroxy-Sai3-meihyl-3,9-bistmethylene)naphtho[l,2-b]furan-2(3H)-one 10,5a-dihydroxy-6(1,7aJf-selina -4( t S), 11(13)-dien -6,12-olide. C,Hffl04 mol wt 264.31. C 68.16%, H 7.63%, O 24.21%. Isoln from seed, herb, and flowers of Tanacetum vulgar, L., Compositae Homolle, J, Pharm. Chim. 7, 57 (1845) Jaretzky, Kiihne, Arch. Pharm. 271, 353 (1933) Suchy, ColL Czech. Chem. Commun. 27, 1058 (1962). Structure and absolute con fig Samek et al.. ibid. 38, 1971 (1973). 

Rohloff, J., R. Mordal, and S. Dragland. 2004. Chemotypical variation of tansy (Tanacetum vulgare L.) from 40 different locations in Norway. J. Agric. Food Chem. 52(6) 1742-1748. 

One of the earliest and most deeply studied plant species from respect of essential oil polymorphism has been tansy Tanacetum vulgar. Formerly—due to the lack of reliable chemical-analytical investigations and systematic evaluation—it has been presented as a characteristic thujone-containing species (Gildemeister and Hofmann, 1968). Although it is true that this is the main component most frequently present in the essential oil, but until today, the number of the detected main compounds in different chemotypes is near to 50. Some of them are summarized... 

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