for the following products
Methyl (1S,2S,3S,4R)-3-[(1R)-1-amino-2-ethylbutyl]-2-hydroxy-4-[(2-methylpropan-2-yl)oxycarbonylamino]cyclopentane-1-carboxylate and (1S,2S,3S,4R)-Methyl 3-((R)-1-amino-2-ethylbutyl)-4-(tert-butoxycarbonylamino)-2-hydroxycyclopentanecarboxylate