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A new naturally occurring linear sesquiterpene (tanacetene) (1) having irregular non-head- to- tail attachment of isoprene units, a new long chain ester (2) and 10 known compounds have been isolated from hexane and chloroform extracts of the roots and aerial parts of Tanacetum longifolium wall. The structure of (tanacetene) (1) was established as (2E,6E,10E)-2,6,11-trimethyl-dodeca-2,6,10-triene and...
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