1-Azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid,3-[[1-(cyclopentylcarbonyl)-4-piperidinyl]thio]-6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-, monosodium salt, (4R,5S,6S)-
CAS No. 886591-18-0