1 SLX (13as)-3,10-dimethoxy-5,8,13,13a-tetrahydro-6h-isoquino[3,2-a]isoquinoline-2,9-diol 1.000 2 DEH 2,9-dihydroxy-3,10-dimethoxy-5,6-dihydroisoquino[3,2-a]isoquinolinium 1.000 3 H68 Tetrahydrocolumbamine 0.885 4 P4V Rotundine 0.786 5 D4R (4r,7ar,12bs)-7,9-dimethoxy-3-methyl-2,4,7a,13-tetrahydro-1h-4,12-methanobenzofuro[3,2-E]isoquinoline 0.741