1-(tert-butyl) 2-methyl (2S,3aR,7aR)-3a-hydroxy-6-oxo-2,3,3a,6,7,7a-hexahydro-1H-indole-1,2-dicarboxylate

(2S,7S,7aS)-1-(tert-butoxycarbonyl)-7-hydroxy-2,3,7,7a-tetrahydro-1H-indole-2-carboxylic acid