Studies in the biochemistry of micro-organisms

A NUMBER of polyhydroxyanthraquinones, all of which are derivatives of 2- methylanthraquinone, have been reported from these laboratories as metabolic products of different species of moulds.They are: helminthosporin, 4:5:8-tri- hydroxy-2-methylanthraquinone, from Helminthosporium gramineum Raben- horst [Charles et al. 1933]; cynodontin, 1:4:5:8-tetrahydroxy-2-methylanthraquinone, from H. cynodontis Marignoni [Raistrick et al. 1933]; catenarin, a 1:5:8-trihydroxy-,B-(hydroxymethyl)-anthraquinone, from H. catenarium Drechs- ler [Raistrick et al. 1934]; tritisporin, a 1:3:5:8-