2,5-anhydro-1-[[[(4-nitrophenyl)methoxy]carbonyl]-L-valyl]amino-1,4-dideoxy-3-thio-D-threo-pentitol

{3-[1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-2-[1-(2-{[3-methyl-2-(4-nitro-benzyloxycarbonylamino)-butyrylamino]-methyl}-tetrahydro-furan-3-ylsulfanylcarbonyl)-ethyl]-4-oxo-azetidin-1-yl}-oxo-acetic acid 4-nitro-benzyl ester

[1(S),3[4R,5S,6S(R)]]-1-[[[[2-(4-nitrophenyl)methoxy]carbonyl]amino-3-methyl-1-oxobutyl]amino]-2,5-anhydro-3-S-[6-(1-hydroxyethyl)-4-methyl-2-[[(4-nitrophenyl)methoxy]carbonyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-en-3-yl]-1,4-dideoxy-3-thio-D-threo-pentitol