Nine Unique Iridoids and Iridoid Glycosides From .

Front Chem

National Center for Research and Development of Edible Fungus Processing Technology, Henan University, Kaifeng, China.

Published: March 2021

is a medical and edible Chinese herb with high nutritional and medicinal value. The continuing study of its chemical constituents led to the discovery of nine unique iridoids and iridoid glycosides, including three new iridoids (-) and six previously unknown irioid glycosides (-), and one known compound (). Among them, compound was a deformed iridoid, while compounds , -, and formed a new ring in their skeletons which was uncommon in this genus. For compound , the new ring existed between C-3 and C-10, while a 1,3-dioxane appeared between C-7 and C-10 in compounds - and . Moreover, compound was a bis-iridoid glycoside, which was the first reported in . . And the sugar of irioid glycosides (-) was glucose at C-11, except in which had a 5-deoxyglucose moiety. All their structures were confirmed based on the extensive spectroscopic analysis, including IR, UV, HR-ESI-MS, ECD, and 1D- and 2D-NMR experiments. Their cytotoxic activities against HL-60, A-549, SMMC-7721, MCF-7, SW480 were also tested.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8039314PMC
http://dx.doi.org/10.3389/fchem.2021.657028DOI Listing

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