Structure of istanbulin A and istanbulin B - two sesquiterpenic lactones from Smyrnium olusatrum L.

Abstract
The structures of istanbulin A (I) and istanbulin B (III), including absolute configurations, have been derived on the basis of spectral methods, primarily a detailed analysis of 1H NMR spectra and circular dichroism measurements. Both substances belong to the type of (4R, 5S,10R)-eremophilan-8,12-olides.

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