Fig. 5
ESI-MS and CID spectra (generated via MSe type analysis) of the main component at 4.23 in fraction B, namely xenocoumacin 2. The component mass spectrum of xenocoumacin 2 (structure insert) is shown in the top spectrum (a) and fragmentation product ion spectrum is shown in the bottom spectrum (b). The two main fragments are indicated on the xenocoumacin 2 structure. Refer to the text for the discussion of the fragmentation of xenocoumacin 2