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Three bislactones belonging to the eremophilane type were isolated from Ligularia przewalskii (Asteraceae): an epoxylactone (eremopetasitenin B4) identical to the previously isolated lactone, whose structure was revised in this work; a new enollactone (eremofarfugin F); and its diastereoisomer at C-11 (eremofarfugin G). This was identical to the reported lactone, whose stereochemistry was left undetermined. The stereochemistry along with the NMR data of this diastereoisomer was assigned in this study

chemistry letters

Isolation and Structure of Three Bislactones, Eremopetasitenin B4and Eremofarfugins F and G, fromLigularia przewalskiiand Revision of the Structure of an Epoxy-lactone Isolated fromLigularia intermedia