Leucinopine, a characteristic compound of some crown-gall tumors

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Abstract
An unusual compound was found in crown-gall tumors [bean (Phaseolus vulgaris), sunflower (Helianthus annulus), tobacco (Nicotiana tabacum), (Lycopersicon esculentum) and Bryophyllum pinnata Pers.] induced by those Agrobacterium tumefaciens strains that utilize neither octopine nor nopaline. The compound was isolated and shown by proton and 13C NMR spectroscopy and by synthesis to be N2-(1,3-dicarboxypropyl)-L-leucine, which also exists in a cyclized (i.e., lactam) form. This compound, which was named leucinopine, was not detected in octopine tumors, nopaline tumors, or the tumors induced by A. tumefaciens strains 181 and EU6.