159194-91-9 5-O-Glucopyranosyl-1-6-glucopyranosylcanthin-6-one 6H-Indolo(3,2,1-de)(1,5)naphthyridin-6-one, 5-((6-O-beta-D-glucopyranosyl-beta-D-glucopyranosyl)oxy)- Bruceolline B