Stoffwechselprodukte von Mikroorganismen. 251. Mitteilung. Die Esmeraldine A und B, tief grüne Farbstoffe aus <i>Streptomyces antibioticus</i>, Stamm Tü 2706

Abstract

The Esmeraldines A and B, Green Pigments from Streptomyces antibioticus , Strain Tü 2706 From a strain of Sterptomyces antibioticus , Tü 2706, two dark green substances, the esmeraldines A and B, 4 and 3 , respectively, were isolated. The structural elucidation was carried out by spectroscopic comparison with some simpler phenazines obtained from the same organism, saphenamycin ( 1 ) and related compounds, and by a series of chemical transformations. Esmeraldin B ( 3 ) is the 6‐methylsalicylic acid ester, and esmeraldin A ( 4 ) a mixture of higher saturated and unsaturated fatty acid esters of esmeraldic acid. The latter is a heterocyclic compound with seven rings and four N‐atoms, formally derived by condensation of two phenazine residues of the saphenic acid family. The esmeraldins are mixtures are of diastereoisomers.