140894-20-8

1-Azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid,6-(1-hydroxyethyl)-4-methyl-3-[[1-[[(4-nitrophenyl)methoxy]carbonyl]-5-[(3-oxo-1-piperazinyl)carbonyl]-3-pyrrolidinyl]thio]-7-oxo-,(4-nitrophenyl)methyl ester