1 RH7 Methyl (5as,8as,10s)-8,8a,9,10-tetrahydro-5h-5a,10-epoxypyrrolo[3',4':4,5]cyclohepta[1,2-B]pyrazine-7(6h)-carboxylate 1.000 2 RKG Methyl (4as,7as,9s)-3,4,7,7a,8,9-hexahydro-4a,9-epoxypyrrolo[3',4':4,5]cyclohepta[1,2-D]imidazole-6(5h)-carboxylate 0.850 3 RJ4 (4ar,7ar,9r)-3,4,7,7a,8,9-hexahydro-4a,9-epoxypyrrolo[3',4':4,5]cyclohepta[1,2-D]imidazole-6(5h)-carbaldehyde 0.750 4 RHY 1-[(4as,7as,9s)-3,4,7,7a,8,9-hexahydro-4a,9-epoxypyrrolo[3',4':4,5]cyclohepta[1,2-D]imidazol-6(5h)-yl]ethan-1-one 0.714