Usaramine, a new pyrrolizidine alkaloid from Crotalaria usaarmoensis E. G. Baker

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Abstract
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.

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