Di-(2-hydroxy-l-phenazinyl)methane, Phenazines, Bacterial Constituents, Pseudomonas aureofaciensThe structure elucidation of di-(2-hydroxy-l-phenazinyl)methane from Pseudomonas aureofaciens is described. In addition to the phenazine derivatives isolated earlier from this bacterium 2,3,4-trihydroxyphenazine-l-carboxylic acid and phenazine-1,6-dicarboxylic acid could be identified.