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

(2S,4S)-methyl 2-((benzyloxycarbonyl)(tert-butoxycarbonyl)amino)-4-(tert-butoxycarbonylamino)-5-hydroxy-4-methylpentanoate