(3R,3'S,4R,4'S)-3,4-diazido-3',4'-bis(methoxymethyloxy)-1,1'-ethylenedipyrrolidine

(3S,3'S,4S,4'S)-3,4-bis(methanesulfonyloxy)-3',4'-bis-(methoxymethyloxy)-1,1'-ethylenedipyrrolidine