Chemistry of fungi. Part VIII. Constituents of Valsaria rubricosa and the identification of papulosin with valsarin
Abstract
Valsarin (3), 7-chloroemodin (5), emodin, and mannitol have been isolated from Valsaria rubricosa. There is mass spectral evidence also for the presence of three further compounds, probably 5,7-dichloroemodin (6) parietin (7), and 1,2,4,5-tetrahydroxy-7-methylanthraquinone (8). ‘Papulosin’ has been shown to be identical with valsarin.