benzyl-(+/-)-β-<<(2-phenylethyl)amino>carbonyl>-β-<<(tricyclo<3.3.1.1>dec-2-yloxy)carbonyl>amino>-1H-indole-3-butanoate
benzyl-(+/-)-β-<<2-(trimethylsilyl)ethoxy>carbonyl>-β-<<(tricyclo<3.3.1.1>dec-2-yloxy)carbonyl>amino>-1H-3-butanoate
benzyl-(+/-)-β-carboxyl-β-<<(tricyclo<3.3.1.1>dec-2-yloxy)carbonyl>amino>-1H-indole-3-butanoate
(+/-)-β-<<(2-phenylethyl)amino>carbonyl>-β-<<(tricyclo<3.3.1.1>dec-2-yloxy)carbonyl>amino>-1H-indole-3-butanoic acid
phenylmethyl-(+/-)-β-cyano-1-<(1,1-dimethylethoxy)carbonyl>-β-<β-2-(trimethylsilyl)ethoxycarbonyl>-1H-indole-3-butanoate