di-tert-butyl ((3S,5S)-5-methyl-2-oxotetrahydro-2H-pyran-3,5-diyl)dicarbamate

(3S,5S)-3-tert-Butoxycarbonylamino-5-tert-butoxycarbonyloxymethyl-3-methyl-2-oxo-pyrrolidine-1-carboxylic acid tert-butyl ester

(2S,6R,E)-methyl 2-((benzyloxycarbonyl)(tert-butoxycarbonyl)amino)-6-hydroxy-4-methylhept-4-enoate

Carbonic acid (2S,4S)-4-tert-butoxycarbonylamino-4-methyl-5-oxo-pyrrolidin-2-ylmethyl ester tert-butyl ester

(R,2Z,4E)-methyl 2-(benzyloxycarbonylamino)-6-(tert-butyl-diphenylsilyloxy)-4-methylhepta-2,4-dienoate

(2S,6R,E)-methyl 2-(benzyloxycarbonylamino)-6-(tert-butyldiphenylsilyloxy)-4-methylhept-4-enoate

(2S,6R,E)-methyl 2-((benzyloxycarbonyl)(tert-butoxycarbonyl)amino)-6-(tert-butyldiphenylsilyloxy)-4-methylhept-4-enoate

((1S,3S)-3-tert-Butoxycarbonylamino-4-hydroxy-1-hydroxymethyl-3-methyl-butyl)-carbamic acid tert-butyl ester

(2S,4S,E)-methyl 2-((benzyloxycarbonyl)(tert-butoxycarbonyl)amino)-4-(tert-butoxycarbonylamino)-4-methylhept-5-enoate

(2S,4S)-2,4-Bis-tert-butoxycarbonylamino-5-hydroxy-2-methyl-pentanoic acid methyl ester

((3S,5S)-5-Hydroxymethyl-3-methyl-2-oxo-pyrrolidin-3-yl)-carbamic acid tert-butyl ester

(2S,6R,E)-methyl 2-((benzyloxycarbonyl)(tert-butoxycarbonyl)amino)-6-(carbamoyloxy)-4-methylhept-4-enoate