5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-((5-amino-5-carboxy-1-oxopentyl)amino)-7-methoxy-8-oxo-3-((sulfothio)methyl)-, (6R-(6alpha,7alpha,7(R*)))- 56487-86-6 SF 1623 SF-1623