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

(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

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