Studies in the biochemistry of micro-organisms. 106. Metabolites of Alternaria tenuis auct.: the structure of tenuazonic acid

described the isolation, from culture filtrates of Alternaria tenui auct. grown on a glucose medium, of a number of metabolic products. Several of these appeared to be related to alternariol, a mycelial product formed by the same strains, and shown by Raistrick, Stickings & Thomas (1953) to be 3:4':5-trihydroxy-6'-methyldibenzo-ax-pyrone. The exception was tenuazonic acid, C1oHL503N, the only nitrogen-containing * Part 105: Birkinshaw & Chaplen (1958). SUMMARY 1. On mild acid hydrolysis, tenuazonic acid yields acetic acid and a deacetyl compound.