Abstract

Abstract After incubation with 5-aminolevulinic acid and cysteine or 5-amino-levulinic acid and glutathione, Cyanidium caldarium excreted two new bile pigments 1 and 2. Their structures are identified by spectroscopical methods. By chemical addition of cysteine, glutathione and hydrogen sulfide to the ethyliden double bond of E-phycocyanobilin, the bile pigments 3-6 were obtained.

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