81036-30-8
{(2R,3S)-3-[(S)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-[3-(tert-butyl-dimethyl-silanyloxy)-propylsulfanylthiocarbonylsulfanyl]-4-oxo-azetidin-1-yl}-hydroxy-acetic acid 4-nitro-benzyl ester
81047-04-3
{(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-[3-(4-nitro-benzyloxycarbonylamino)-propylsulfanylthiocarbonylsulfanyl]-4-oxo-azetidin-1-yl}-(triphenyl-λ5-phosphanylidene)-acetic acid 4-nitro-benzyl ester
81225-24-3
p-nitrobenzyl (5R,6S)-6-<(1R)-(tert-butyldimethylsiloxy)ethyl>-2-(2-p-nitrobenzyloxycarbonylaminoethyl)-2-penem-3-carboxylate
81225-30-1
p-nitrobenzyl (5R,6S)-6-<(1R)-(tert-butyldimethylsiloxy)ethyl>-2-(3-p-nitrobenzyloxycarbonylaminopropan-1-yl)-2-penem-3-carboxylate
81036-28-4
{(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-[3-(4-nitro-benzyloxycarbonylamino)-propylsulfanylthiocarbonylsulfanyl]-4-oxo-azetidin-1-yl}-hydroxy-acetic acid 4-nitro-benzyl ester