From Drosera spathulata obtained by in vitro culture the known 1,4-naphthoquinones-7-methyljuglone, artefactual 2- and 3-methoxy-7-methyljuglone, together with 7-methyl-1,4,5-trihydroxynaphthalene 4-O-glucoside (rossoliside) were isolated. The structure of the last-named compound, was substantiated by NMR correlation techniques. It was also shown that 7-methyljuglone can be very easily released from rossoliside.
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