It has been established that arugosin C, C25H28O6, an optically active metabolite of A. rugulosus, has the dibenz-[b,e]oxepin structure (IV) and is, therefore, closely related to arugosin A. This structure was established by mass spectrometry and by a comparison of the 1H and 13C n.m.r. spectra with those of arugosin A.
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Ballantine et al. (1973) studied this question.