Spiro[3H-indole-3,6′-[7]oxa[2]azabicyclo[2.2.1]heptane]-1,4′,5′(2H)-tricarboxylic acid, 1′,2′-dimethyl-2,3′-dioxo-, 1,5′-bis(1,1-dimethylethyl) 4′-ethyl ester, (1′R,3R,4′S,5′S)-rel-

Spiro[3H-indole-3,6′-[7]oxa[2]azabicyclo[2.2.1]heptane]-1,5′(2H)-dicarboxylic acid, 4′-acetyl-2′-methyl-1′-(2-naphthalenyl)-2,3′-dioxo-, 1,5′-bis(1,1-dimethylethyl) ester, (1′R,3R,4′R,5′S)-rel-

Spiro[3H-indole-3,6′-[7]oxa[2]azabicyclo[2.2.1]heptane]-1,5′(2H)-dicarboxylic acid, 4′-acetyl-1′-(4-methoxyphenyl)-2′-methyl-2,3′-dioxo-, 1,5′-bis(1,1-dimethylethyl) ester, (1′R,3R,4′R,5′S)-rel-

Spiro[3H-indole-3,6′-[7]oxa[2]azabicyclo[2.2.1]heptane]-1,5′(2H)-dicarboxylic acid, 4′-acetyl-2′-methyl-1′-(4-methylphenyl)-2,3′-dioxo-, 1,5′-bis(1,1-dimethylethyl) ester, (1′R,3R,4′R,5′S)-rel-

Spiro[3H-indole-3,6′-[7]oxa[2]azabicyclo[2.2.1]heptane]-1,5′(2H)-dicarboxylic acid, 4′-acetyl-1′-(4-chlorophenyl)-2′-methyl-2,3′-dioxo-, 1,5′-bis(1,1-dimethylethyl) ester, (1′R,3R,4′R,5′S)-rel-

Spiro[3H-indole-3,6′-[7]oxa[2]azabicyclo[2.2.1]heptane]-1,5′(2H)-dicarboxylic acid, 4′-acetyl-1′-(3-chlorophenyl)-2′-methyl-2,3′-dioxo-, 1,5′-bis(1,1-dimethylethyl) ester, (1′R,3R,4′R,5′S)-rel-

Spiro[3H-indole-3,6′-[7]oxa[2]azabicyclo[2.2.1]heptane]-1,5′(2H)-dicarboxylic acid, 4′-acetyl-1′-(2-chlorophenyl)-2′-methyl-2,3′-dioxo-, 1,5′-bis(1,1-dimethylethyl) ester, (1′R,3S,4′S,5′R)-rel-

Spiro[3H-indole-3,6′-[7]oxa[2]azabicyclo[2.2.1]heptane]-1,5′(2H)-dicarboxylic acid, 4′-acetyl-2′-methyl-2,3′-dioxo-1′-phenyl-, 1,5′-bis(1,1-dimethylethyl) ester, (1′R,3R,4′R,5′S)-rel-

Spiro[6H-3,10a-epoxypyrido[1,2-a]azepine-1(2H),3′-[3H]indole]-1′,2(2′H)-dicarboxylic acid, 3-acetyl-3,4,7,8,9,10-hexahydro-2′,4-dioxo-, 1′,2-bis(1,1-dimethylethyl) ester, (1R,2S,3R,10aR)-rel-

Spiro[3H-indole-3,6′-[7]oxa[2]azabicyclo[2.2.1]heptane]-1,5′(2H)-dicarboxylic acid, 4′-acetyl-7-chloro-1′,2′-dimethyl-2,3′-dioxo-, 1,5′-bis(1,1-dimethylethyl) ester, (1′R,3R,4′R,5′S)-rel-

rel-1,5′-Bis(1,1-dimethylethyl) (1′R,3R,4′R,5′S)-4′-acetyl-1′,2′,5,7-tetramethyl-2,3′-dioxospiro[3H-indole-3,6′-[7]oxa[2]azabicyclo[2.2.1]heptane]-1,5′(2H)-dicarboxylate

rel-1,5′-Bis(1,1-dimethylethyl) (1′R,3R,4′R,5′S)-4′-acetyl-6-bromo-1′,2′-dimethyl-2,3′-dioxospiro[3H-indole-3,6′-[7]oxa[2]azabicyclo[2.2.1]heptane]-1,5′(2H)-dicarboxylate

rel-1,5′-Bis(1,1-dimethylethyl) (1′R,3R,4′R,5′S)-4′-acetyl-6-chloro-1′,2′-dimethyl-2,3′-dioxospiro[3H-indole-3,6′-[7]oxa[2]azabicyclo[2.2.1]heptane]-1,5′(2H)-dicarboxylate

rel-1,5′-Bis(1,1-dimethylethyl) (1′R,3R,4′R,5′S)-4′-acetyl-6-fluoro-1′,2′-dimethyl-2,3′-dioxospiro[3H-indole-3,6′-[7]oxa[2]azabicyclo[2.2.1]heptane]-1,5′(2H)-dicarboxylate

rel-1,5′-Bis(1,1-dimethylethyl) (1′R,3R,4′R,5′S)-4′-acetyl-6-methoxy-1′,2′-dimethyl-2,3′-dioxospiro[3H-indole-3,6′-[7]oxa[2]azabicyclo[2.2.1]heptane]-1,5′(2H)-dicarboxylate

rel-1,5′-Bis(1,1-dimethylethyl) (1′R,3R,4′R,5′S)-4′-acetyl-5,6-difluoro-1′,2′-dimethyl-2,3′-dioxospiro[3H-indole-3,6′-[7]oxa[2]azabicyclo[2.2.1]heptane]-1,5′(2H)-dicarboxylate

rel-1,5′-Bis(1,1-dimethylethyl) (1′R,3R,4′R,5′S)-4′-acetyl-5-methoxy-1′,2′-dimethyl-2,3′-dioxospiro[3H-indole-3,6′-[7]oxa[2]azabicyclo[2.2.1]heptane]-1,5′(2H)-dicarboxylate

rel-1,5′-Bis(1,1-dimethylethyl) (1′R,3R,4′R,5′S)-4′-acetyl-1′,2′,5-trimethyl-2,3′-dioxospiro[3H-indole-3,6′-[7]oxa[2]azabicyclo[2.2.1]heptane]-1,5′(2H)-dicarboxylate