From the mycelium of Penicillium hirayamae UDAGAWA two hitherto undescribed metabolites have been isolated. The major product is a levorotatory isomer of the known sclerotiorin. The minor component, rubrotiorin, C21H21∼23O4Cl, m. p. 172°, is given as red needles and appears to be a new azaphilone compound.
