Three new oxaphenalenone dimers, bacillosporins A-C, and one known xanthone carboxylic acid, pinselin, were isolated from a fungus, Talaromyces bacillosporus. Bacillosporin A (1) is an acetyl derivative of B (2). Bacillosporin A was transformed to xenoclauxin (5), a known oxaphenalenone dimer, by 2, 3-dichloro-5, 6-dicyanobenzoquinone (DDQ) oxidation. The hemiketal structure of bacillosporin C (7) was proposed on the basis of the spectral data for the compound itself and the hydrogenolysis product (9).
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Yamazaki et al. (1980) studied this question.