N-Formyl-α-aethoxycarbonyl-γ-oxo-DL-norvalin-aethylester
N-Formyl-δ-brom-γ-oxo-DL-norvalin
N-Acetyl-α-aethoxycarbonyl-γ-oxo-δ-acetoxy-DL-norvalin-aethylester
N-Acetyl-α-aethoxycarbonyl-γ-oxo-δ-hydroxy-DL-norvalin-aethylester
2-acetylamino-5-chloro-4-oxo-valeric acid ethyl ester