(4S,4aR,6S,7S,8aS)-4-ethyl-7-hydroxyoctahydro-3H-6,4-(epiminomethano)isochromen-3-one

(4S,4aR,6S,7S,8aS)-9-benzoyl-4-ethyl-7-hydroxyoctahydro-3H-6,4-(epiminomethano)isochromen-3-one

(4S,4aR,6S,8aS)-9-benzoyl-4-ethylhexahydro-1H-6,4-(epiminomethano)isochromene-3,7-dione

(4S,4aR,6S,11cR)-12-benzoyl-7-benzyl-4-ethyl-4,4a,5,6,7,11c-hexahydro-6,4-(epiminomethano)pyrano[4,3-c]carbazol-3(1H)-one

((1S,4S,5R,6R)-2,11-dibenzyl-4-ethyl-2,3,4,5,6,11-hexahydro-1H-1,5-methanoazocino[3,4-b]indole-4,6-diyl)dimethanol