1,1-(((4-Pyridylthio)acetyl)amino)-2-aza-8-furo-9,10-oxo-4-thiatricyclo(7.2.2.0)undeca-1-ene 60517-75-1 Acetamide, 2-(4-pyridinylthio)-N-(1,4,5a,6-tetrahydro-1,7-dioxo-3H,7H-azeto(2,1-b)furo(3,4-d)(1,3)thiazin-6-yl)-, (6R-trans)- Cephapirin lactone Deacetylcephapirin lactone