Studies on the Metabolic Products of Macrosporium Porri Elliott

Macrosporin monoluethylether was synthesized by means of condensation between α-resorcylic acid (I) and 3-methoxy-p-toluic acid (II) with the use of conc. sulfuric acid and boric anhydride.

From this result macrosporin C₁₆H₁₂O₅, a metabolic product of Macrosporium Porri Elliott, was established to be 3,5-dihydroxy-7-methoxy-2-methyl anthraquinone (A).