3,4-O-(二乙基甲基亚基)莽草酸乙酯

(3R,4R,5S)-ethyl-4-azido-5-(tert-butoxycarbonylamino)-3-hydroxycyclohex-1-enecarboxylate

(1S,5S,6S)-ethyl 5-(tert-butoxycarbonylamino)-7-azabicyclo[4.1.0]hept-3-ene-3-carboxylate

(2R,3S,4S,5S)-5-(benzyloxy)-2-(hydroxymethyl)-4-(pentan-3-yloxy)tetrahydrofuran-3-ol