From the gun resin Ammoniacum, an epimeric mixture 2a/3a of highly functionalized prenylated chromandiones was isolated. Their structure was established by spectral data and single-crystal X-ray analysis. The compounds were isolated as acetates 2b/3b, and these derivatives showed in uiuo haemorrhagic activity. . We report here the isolation of a mixture of epimeric non-phenolic compounds occurring in Ammoniacum in a concentration comparable to that of 1.
Introduction