(3R,4S,5S)-3-Methoxy-5-methyl-4-{methyl-[(S)-3-methyl-2-(3-methyl-butyrylamino)-butyryl]-amino}-heptanoic acid

(3R,4S,5S)-4-{[(S)-2-(2-Dimethylamino-acetylamino)-3-methyl-butyryl]-methyl-amino}-3-methoxy-5-methyl-heptanoic acid

(3R,4S,5S)-4-{[2-((S)-2-Dimethylamino-3-methyl-butyrylamino)-acetyl]-methyl-amino}-3-methoxy-5-methyl-heptanoic acid

(3R,4S,5S)-4-{[(S)-2-((S)-2-Dimethylamino-propionylamino)-3-methyl-butyryl]-methyl-amino}-3-methoxy-5-methyl-heptanoic acid

(3R,4S,5S)-4-[((S)-2-Amino-3-phenyl-propionyl)-methyl-amino]-3-methoxy-5-methyl-heptanoic acid tert-butyl ester