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Phytochemical investigation of an extract of the aerial and underground parts of Phlomis likiangensis resulted in the identification of five new iridoid glycosides, namely as 5,9-epi-6-methoxy-7,8-dehydropenstemonoside (1), 6-methoxy-7,8-dehydropenstemonoside (2), 6-methoxy-7,8-dehydropenstemoside (3), 6-ethoxy-7,8-dehydropenstemoside (4), and phloloside G (5). On the basis of a combination of spectroscopic...
Chemical study on the aerial parts of Phlomis likiangensis unearthed six new iridoid glycosides, phlolosides A–F (1–6), together with six known analogues (7–12). In the light of a combination of spectroscopic data, acid hydrolysis and single crystal X-ray diffraction analysis, the structures of 1–6 were determined. This is the first discovery of iridoid glycosides assembling a carbonate ester substituent...
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