tert-butyl 20-azido-3,6,9,12,15,18-hexaoxaeicosanoate

2-(2-(2-(2-(2-(2-t-butyloxycarbonylaminoethoxy)ethoxy)ethoxy)ethoxy)ethoxy)ethoxyacetatic acid

17-azido-3,6,9,12,15-pentaoxaheptadecyl (4-nitrophenyl) carbonate