Studies on the Metabolic Products of Rosellinia necatrix Berlese

A new inhibitor of plant growth, named rosellinic acid, C₁₁H₁₀O₅, m.p. 206~208°C, has been isolated from the culture filtrate of Rosellinia necatrix Berlese. Rosellinic acid has one C-methyl, one phenolic hydroxyl and one aryl carboxylic acid group. Fusion with alkali gave 4,5-dihydroxyisophthalic acid, and the results of physical and chemical tests on the rosellinic acid led to the conclusion that the formula of 6-carboxy-8-hydroxy-2-methylchromanone seems the most possible structure.