(3aR,8aS)-3a-(tert-butyldimethylsilyloxy)-8-(2-methoxycarbonylpropyl)-3,3a,8,8a-tetrahydro-2H-furo[2,3-b]indole

[(2S),3aR,8aS]-3a-(tert-butyldimethylsilyloxy)-8-(2-methoxycarbonylpropyl)-3,3a,8,8a-tetrahydro-2H-furo[2,3-b]indole

[(2S),3aR,8aS]-3a-(tert-butyldimethylsilyloxy)-8-(2-carboxypropyl)-3,3a,8,8a-tetrahydro-2H-furo[2,3-b]indole

[(2S),3aR,8aS]-3a-(tert-butyldimethylsilyloxy)-8-(2-methyl-3-trimethylacetoxypropyl)-3,3a,8,8a-tetrahydro-2H-furo[2,3-b]indole

(3aR,8aS)-3-(1,1-dimethyl-2-propenyl)-2,3,3a,8a-tetrahydrofuroindole