... Drosera [21] Naphthoquinone Droserone Hydroxydroserone Biramentaceonea Droserone -5 - glucoside Rossoliside Hydroxydroserone -5 - glucoside 2-Methylnaphtazarin -5 - O- ... Hydroxydroserone [5] H H CH3 OH OGlc Droserone -5 - glucoside [6] OH H CH3 OH OGlc Hydroxydroserone -5 - gluside R6 R7 [7] CH3 H Rossoliside [8] H CH3 2-Methyl-hydrojuglone-4-glucoside ... 5 (0,2 mg/l) 2,4-D 53 55 55 ...