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Nor-Carotenoid, Rhizobium lupini The mutant strain 1-289 of Rhizobium lupini containes in addition to the normal carotenoid pattern a violet carotenoid whose structure was derived by MS and 270  1 H-NMR as 2′,3′-trans-dihydroxy-2-nor-β,β-carotene-3,4-dione. The possible biochemical origin of this compound is dis cussed.

Carotenoids of Rhizobia. III. 2',3'-trans-Dihydroxy-2-nor-β, β-carotene-3,4-dione, a Novel Carotenoid from a Mutant of Rhizobium lupini