(5R,6S)-6-(1(R)-Hydroxyethyl)-2-(2(R)-tetrahydrofuryl)penem-3-carboxylic acid monosodium salt 122547-49-3 4-Thia-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid, 6-(1-hydroxyethyl)-7-oxo-3-(tetrahydro-2-furanyl)-, monosodium salt, (5R-(3(R*),5-alpha,6-alpha(R*)))- ALP 201 CCRIS 6723 Fropenem sodium Fropenum sodium SUN 5555 SY5555 YM-044