The correct structures of xanthomegnin, rubro-sulphin, and viopurpurin have been established as naphtho[2,3-c]pyran-8-yl dimers from 13C n.m.r. data.
G. Höfle and K. Röser, J. Chem. Soc., Chem. Commun., 1978, 611 DOI: 10.1039/C39780000611
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