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From flower heads of a tetraploid clone of Achillea ceretanica two further guaianolides were isolated by repeated column chromatography and HPLC. The constitution and the stereochemistry of these new, unstable compounds were determined by MS, one- and two-dimensional NMR-techniques ( 1 H-, 13 C-NMR, COSY-, HSQC-, TOCSY-, selective TOCSY- and NOE-experiments) as well as by comparison...
From flower heads of Achillea asiatica (L.) Serg., three new guaianolides were isolated by repeated column chromatography and HPLC. The constitution and the stereochemistry of these new, labile compounds were determined by MS, one ( 1 H, 13 C, selective 1 H-TOCSY and 1 H-NOESY) and two-dimensional NMR experiments ( 1 H, 1 H-COSY, 1 H, ...
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