Stoffwechselprodukte von Mikroorganismen, XXVII[1] Cyclopaldsäure und 3-O-Methyl-cyclopolsäure, zwei antibiotisch wirksame Substanzen aus Aspergillus duricaulis/Investigations on Metabolites of Microorganisms, XXVII [1] Cyelopaldic Acid and 3-O-Methyl Cyclopolic Acid, Two Antibiotically Active Substances from Aspergillus duricaulis

Abstract
3,5-Dihydroxy-4-formyl-7-methoxy-6-methyl-1(3H)-isobenzofuranone [=cyclopaldic acid] (1) and 5-hydroxy-4-hydroxymethyl-3,7-dimethoxy-6-methyl-1(3H)-isobenzofura-none [= 3-O-methyl cyclopolic acid] (2) were isolated from Aspergillus duricaulis-, those compounds were found to be antibiotically active.