
%0 Journal Article
%A Culvenor, CCJ 
%A Smith, LW 
%T Usaramine, a new pyrrolizidine alkaloid from <I>Crotalaria usaarmoensis</I> E. G. Baker
%J Australian Journal of Chemistry
%D 1966/11/01
%V 19
%N 11
%P 2127-2131
%K 
%R https://doi.org/10.1071/CH9662127
%U https://www.publish.csiro.au/paper/CH9662127 
%X The major alkaloid, usaramine, of the seed of C. usaramoensis E. G. Baker, is shown to be the geometric isomer of retrorsine; i.e. an ester of retronecine with retronecic acid. Other alkaloids in the seed are integerrimine, traces of senecionine and retrorsine, and two unidentified non-ester bases. The previously reported usaramoensine1 was not detected and is considered to be a mixture. 
