(S)-2-{Methyl-[(S)-3-methyl-2-(methyl-{(S)-3-methyl-2-[methyl-((S)-3-methyl-2-methylamino-butyryl)-amino]-butyryl}-amino)-butyryl]-amino}-3-phenyl-propionic acid tert-butyl ester

(2R)-2-methyl-oct-7-ynoic acid

(2R)-2-methyl-7-oxo-heptanoic acid methyl ester

7-benzyloxy-heptanoic acid methyl ester

(2R)-7-benzyloxy-2-methyl-heptanoic acid