cephams

https://doi.org/10.1351/goldbook.C00940
Natural and synthetic antibiotics containing the 5-thia-1-azabicyclo[4.2.0]octan-8-one @[email protected]; generally assumed to have the 6R configuration, unless otherwise specified. The numbering used differs from that of the von Baeyer named bicyclic system. Where they differ, the von Baeyer numbering is shown in parentheses.
C00940.png
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1327 [Terms] [Paper]