Pigments of fungi. LV - The absolute configuration of dermocanarin 4 and the structure and stereochemistry of the dermocanarins 5, 6, 8 and 9 from Australian toadstools belonging to the genus Cortinarius

The stereochemistry in the dihydroanthracenone ring of dermocanarin 4 (1) i s defined as (S) by incorporation of the gentiobioside (2) of (S)-[6-OMe-C- 13]torosachrysone into the dihydroanthracenone ring of dermocanarin 4 by fr uiting bodies of Cortinarius sinapicolor. In addition, the new dermocanarin s 5 (3), 6 (4), 8 (5) and 9 (6) are isolated from two other indigenous toad stools belonging to Cortinarius and their structure and stereochemistry are deduced from the respective spectroscopic data and by comparison with derm ocanarin 4 (1).