On the structure of rubrifacine

Abstract
Evidence is presented that rubrifacine, the red pigment of Erwiniarubrifaciens, is 3-(3-carboxymethyl-4,5-dihydro-4,5-dioxo-2-pyrrolyl)-4,5,6-trihydroxypyridine-2-acetic acid, based on mass spectrometric and nmr data of rubrifacine, its hydrolysis and reduction products as well as their methyl derivatives.

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