1 FGH 2,7,7-trimethyl-9-[8-(2-methylpropyl)-1-oxo-1,2,3,4-tetrahydroisoquinolin-6-yl]-1,2,3,4,6,7,8,9-octahydro-5h-beta-carbolin-5-one 1.000 2 2R6 8-(2-methylpropyl)-6-(3,6,6-trimethyl-4-oxo-4,5,6,7-tetrahydro-1h-indol-1-yl)-3,4-dihydroisoquinolin-1(2h)-one 0.818 3 2Q9 2,7,7-trimethyl-9-[1-oxo-8-(propan-2-ylamino)-1,2,3,4-tetrahydroisoquinolin-6-yl]-1,2,3,4,6,7,8,9-octahydro-5h-beta-carbolin-5-one 0.778