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2023
It is built from checkable properties of the record itself: whether the article has a DOI, how many independent sources confirmed its data, whether the required fields are filled in, and how recent the latest confirmation is. Disagreement between sources and a missing identifier lower it. A value of 80 or above means the record was published without further checking; 60 to 79 means it is published at reduced confidence, with a manual check advisable. A record verified by an editor by hand is never pushed below 90 by a recalculation. This scores our data about the article, not the article itself.
Abstract As a result of studying the chemical composition of the Kazakhstan endemic species Tanacetopsis Pjataevae (Tanacetopsis Pjataevae (Kovalevsk.) Karmyscheva), the following guaianolide-type γ-lactones are isolated: arglabin, β-isoepoxyestafiatin, and a new 3-keto-10β-hydroxy-5,7α,4,6β(H)-gvai-1,11(13)-diene-6,12-olide guaianolide. The structure of these compounds is established by X-ray diffraction.