The Combined Nomenclature (CN), v1:2025
formyloxy-2-phenylacetamido]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, 1-[2-"1,3-dioxan-2-yl"ethyl]-2-methylpyridinium bromide, and
https://www.dst.dk/en/Statistik/dokumentation/nomenklaturer/kn?id=3297a864-18b0-4927-8f75-9f2fa29c9c69