Structures are proposed for axillarine and axillaridine, isolated from Crotalaria axillaris seed. The significance of these structures in relation to the biosynthesis of pyrrolizidine alkaloids which contain macrocyclic diester rings is discussed.
D. H. G. Crout, J. Chem. Soc. C, 1969, 1379 DOI: 10.1039/J39690001379
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