The nature of intramolecular N--C equals O interactions. Crystal structure of the Senecio alkaloid senkirkine.
D000470:Alkaloids; D010947:Plants, Toxic; D011763:Pyrrolizidine Alkaloids; D012674:Senecio; D014961:X-Ray Diffraction
D000470:Alkaloids; D011763:Pyrrolizidine Alkaloids; C009238:senkirkine