(2S,3aS,7aR)-7a-(2-oxoethyl)-octahydroindole-1,2-dicarboxylic acid 1-benzyl ester 2-tert-butyl ester

(2S,3aS,7aR)-7a-allyl-octahydroindole-1,2-dicarboxylic acid 1-benzyl ester 2-tert-butyl ester

(2S,3aS,7aR)-7a-[3-(N-benzyloxycarbonyl-N'-tert-butoxycarbonylamino)-3-methoxycarbonyl-allyl]-octahydroindole-1,2-dicarboxylic acid 1-benzyl ester 2-tert-butyl ester

(2S,3aS,7aS)-2,3,3a,4,7,7a-hexahydroindole-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl ester