The structures of some new bianthraquinones isolated from Penicillium islandicum Sopp were established as (IX〜XTV). The revised structures of rugulosin (XXI), luteoskyrin (XXII) and rubroskyrin (XXIII) are discussed mainly on the basis of the results of NMR spectral analysis (see Fig. I, II and III; Tab. I and II).
