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Key Word Index: Capsicum annuum L.; Structure of New Capsaicinoids. AbstractA detailed study of the pungent principle of Capsicum annuurn L. var. annuurn allowed the detection and structure determination of two isomers of homocapsaicin and homodihydrocapsaicin, respectively. The vanillylamides of caprylic acid and decylic acid were isolated and characterized by means of mass-and H-NMR-spectra. The presence of bishomo-and trishomocapsai-. cin was detected by accurate mass-measurernents.

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The electron impact mass spectrometric fragmentation of trans‐3‐ and trans‐4‐styrylpyridazine is reported in detail, including a comparison with other aza‐stilbenes. With regard to a distinction between the two isomeric styrylpyridazines, the intensity ratio of the M+ and [M‐1]+ ions, the general degree of fragmentation and the elimination pathways of nitrogen proved to be most characteristic.