1-benzyl-5-methoxy-1'-methyl-1H-spiro[indole-3,3'-pyrrolidin]-2-one
(R)-1-benzyl-1'-methyl-5-methoxy-2-oxospiro(3H-indole-3,3'-pyrrolidine)
(S)-1-benzyl-3-(3-methylbut-2-enyl)-5-methoxy-3-(2-nitroethyl)-2-oxindole
(R)-1-benzyl-1'-ethoxycarbonyl-5-methoxy-2-oxospiro(3H-indole-3,3'-pyrrolidine)
(S)-3-<1-benzyl-3-(3-methylbut-2-enyl)-5-methoxy-2-oxindolyl>acetic acid